Answer:
84.6%
Explanation:
The percent yield of NH₃ when 15.0 grams of nitrogen gas reacts with an excess of hydrogen gas to produce 15.4 grams of NH₃ is 84.57%.
What is the percent yield?"Percent yield is the deviation in the percent of theoretical yield to the percent of actual yield."
Percent yield = actual yield / theoretical yield x 100
The chemical equation will be
N₂ + 3H₂ = 2NH₃
In the reaction, the limiting reagent is N₂, and the percent yield is calculated by the limiting reagent.
By the reaction, we can see that 1 mol of N₂ produces 2 mol of NH₃
28 grams of N₂ will produce 34 grams of NH₃
15.0 N₂ will produce 34 x 15 / 28 = 18.21 grams of NH₃
The actual yield is 15.4
The theoretical yield is 18.21
Percent yield = 15.4 / 18.21 x 100 = 84.57%.
Therefore, the percent yield of NH₃ is 84.57%.
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A badger is running at a speed of 1 m/s. If the badger moves that was for 2600 seconds, how far will the badger travel?
Answer:
[tex]d=2600m[/tex]
Explanation:
Hello,
In this case, since the velocity is computed via the distance divided by the elapsed time:
[tex]v=\frac{d}{t}[/tex]
We can easily compute the how far it will travel as shown below:
[tex]d=v*t=1m/s*2600s\\\\d=2600m[/tex]
Best regards.
From left, an orange H, then 1 black dot above 1 orange dot, then a black O with 2 black dots both above and below, then 1 black dot above 1 orange dot, then an orange H. Refer to the diagram to complete the sentence with the correct numbers. When hydrogen shares electrons with oxygen, the outermost shell of the hydrogen atoms are full with electrons and oxygen’s valence shell is full with electrons. Because the valence shells of these atoms are full, the atoms are stable.
Answer:
2 & 8
Explanation:
just got it right <3 gl
According to the electronic configuration, when hydrogen shares electrons with oxygen , hydrogen atom has 2 electrons and oxygen atom has 8 electrons.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Express the number 4.80x10-1 in standard form
what are some habits of the woodhouse's toads
Answer:
Behavior
Explanation:
Near human habitaciones these toads may congregate underneath outsider lights to feed one the insects the attract.
A cubic piece of platinum metal (specific heat capacity = 0.1256 J/°C･g) at 200.0°C is dropped into 1.00 L of deuterium oxide ('heavy water,' specific heat capacity = 4.211 J/°C･g) at 25.5°C. The final temperature of the platinum and deuterium oxide mixture is 41.9°C. The density of platinum is 21.45 g/cm³ and the density of deuterium oxide is 1.11 g/mL. What is the edge length of the cube of platinum, in centimeters?
Answer:
[tex]a=5.65cm[/tex]
Explanation:
Hello,
In this case, for this heat transfer process in which the heat lost by the hot platinum is gained by the cold deuterium oxide based on the equation:
[tex]Q_{Pt}=-Q_{Deu}[/tex]
We can represent the heats in terms of mass, heat capacities and temperatures:
[tex]m_{Pt}Cp_{Pt}(T_f-T_{Pt})=-m_{Deu}Cp_{Deu}(T_f-T_{Deu})[/tex]
Thus, we solve for the mass of platinum:
[tex]m_{Pt}=\frac{-m_{Deu}Cp_{Deu}(T_f-T_{Deu})}{Cp_{Pt}(T_f-T_{Pt})} \\\\m_{Pt}=\frac{-1.00L*1110g/L*4.211J/(g\°C)*(41.9-25.5)\°C}{0.1256J/(g\°C)*(41.9-200.0)\°C} \\\\m_{Pt}=3860.4g[/tex]
Next, by using the density of platinum we compute the volume:
[tex]V_{Pt}=\frac{3860.4g}{21.45g/cm^3}\\ \\V_{Pt}=180cm^3[/tex]
Which computed in terms of the edge length is:
[tex]V=a^3[/tex]
Therefore, the edge length turns out:
[tex]a=\sqrt[3]{180cm^3}\\ \\a=5.65cm[/tex]
Best regards.
g Which statement is false? According to the rate law, the greater the rate constant (k), the faster the rate of reaction is. According to the Arrhenius equation, the greater the collision frequency of molecules (A), the greater the rate constant (k) is. According to the Arrhenius equation, the greater the activation energy of the reaction (Ea), the greater the rate constant (k) is. According to the Arrhenius equation, the greater the temperature of reaction (T), the greater the rate constant (k) is.
Answer:
According to the Arrhenius equation, the greater the activation energy of the reaction (Ea), the greater the rate constant (k) is.
Explanation:
Rate law in chemistry describes the relationship between the concentration of reactants and the rate of reaction. In the rate law expression i.e. Rate = K {X}, K is the proportionality constant called RATE CONSTANT. The greater the value of this rate constant (k), the faster the rate of reaction is.
According to the Arrhenius equation, mathematically written as:
K= Ae (-EA/RT) where; k is the rate constant, Ea is the activation energy, T= temperature, R= gas constant.
- The collision frequency of molecules is dependent on the temperature, which when increases causes an increase in the rate constant.
- In the presence of a catalyst, the activation energy is lowered causing the rate of reaction to increase, meaning that the rate constant is increased. Hence, the GREATER the activation energy of the reaction (Ea), the LOWER the rate constant (k) is.
- An increase in temperature causes the rate of constant (K) to increase.
What is the true ratio of atoms in a molecule or formula unit called?
O the molecular formula
O the molar mass
O the percent composition
O the empirical formula
Answer:
the molar mass
Explanation:
Answer:
The molecular formula
Explanation:
A on edge
The compound NaCl (salt) has the same properties as sodium (Na) and chlorine (CI) because it is made of both of those elements. True False
Answer:
False.
Explanation:
Hello.
In this case since sodium is a soft brilliant metal and chlorine is a green gas at normal conditions, they have totally different properties. Thus, since sodium chloride is also known as the table salt which is present as white crystals we can infer that the compound does not have the same properties, therefore it is false.
Regards.
A marble has a density of 11 g/cm3 and when dropped in a graduated cylinder increases the water level from 2 mL to 4 mL of volume. What is the mass of the marble in grams?
Answer:
The answer is 22 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density = 11 g/cm³
volume = final volume of water - initial volume of water
volume = 4 - 2 = 2 mL
But 1 mL = 1 cm³
2 mL = 2 cm³
volume = 2 cm³
The mass of the marble is
mass = 11 × 2
We have the final answer as
22 gHope this helps you
A student performed an investigation at sea level. First she placed 400 mL of water in four different containers. Then she placed the containers on hot plates with four different temperature settings, as shown in the table.
Answer:
C. The boiling point of water
Explanation:
We assume your question is the one attached.
Obviously, the shape of the (liquid) water is a function of the container it is in, as it is for any liquid or gas.
The rate of evaporation will depend on the temperature and on the surface area. The different containers are different in both ways, so evaporation is not a constant.
The boiling point is a physical property of the water, so will be the same across all containers.
The amount of steam released is related to the rate of evaporation. It will not be a constant across the different containers.
__
The appropriate choice is ...
The boiling point of water
The chemical name for laughing gas is dinitrogen oxide. The two elements found in a sample of this gas are and .
Mass of Mg (g): 0.2000 Mass of oxide (g): 0.3317 1. Determine the empirical formula of the oxide of magnesium. (Think carefully about the precision of each mass that you measured before you do this calculation. How many significant figures are justified for each mass?) 2. Write the correctly balanced chemical equation for the reaction of magnesium with molecular oxygen. 3. Write the correctly balanced chemical equation for the reaction of magnesium with molecular nitrogen. 4. Write the correctly balanced chemical equation for the reaction of magnesium nitride with water. 5. Write the correctly balanced chemical equation for the reaction of heating magnesium hydroxide
Answer:
1. Empirical formula is MgO
2. 2Mg + O₂ --> 2MgO
3. 3Mg + N₂ ---> Mg₃N₂
4. Mg₃N₂ + 6H₂O ----> 3Mg(OH)₂ + 2NH₃
5. Mg(OH)₂ ---> MgO + H₂O
Explanation:
1. Empirical formula:
mass of magnesium oxide = 0.3327 g; mass of magnesium = 0.2000 g
mass of oxygen = 0.3317 g - 0.2000 g = 0.1317 g
molar mass of magnesium = 24, molar mass of oxygen = 16
molar ratio of magnesium to oxygen is then calculated;
magnesium = 0.2000/24 = 0.0083 : oxygen = 0.1317/16 = 0.0082
magnesium = 0.0083/0.0082 = 1 : oxygen = 0.0082/0.0082 = 1
molar ratio of magnesium to oxygen = 1 : 1
Therefore, empirical formula is MgO
2. The reaction of magnesium with molecular oxygen produces magnesium oxide as shown by the equation below:
2Mg + O₂ --> 2MgO
3. The reaction of magnesium with molecular nitrogen produces magnesium nitride as shown by the equation below:
3Mg + N₂ ---> Mg₃N₂
4. The reaction of magnesium nitride with water produces magnesium hydroxide and ammonia gas as shown by the equation below:
Mg₃N₂ + 6H₂O ----> 3Mg(OH)₂ + 2NH₃
5. The products of the reaction of heating magnesium hydroxide are magnesium oxide and water as shown by the equation below:
Mg(OH)₂ ---> MgO + H₂O
Review the following statements regarding properties of real and ideal gases. Identify the statement that is not correct? Group of answer choices The ratio PV/RT = 1 for one mole of an ideal gas. The ratio PV/nRT < 1 for one mole of a real gas because of repulsive interactions between the molecules. The ratio PV/nRT > 1 for one mole of a real gas because of the finite size of the molecules. At low temperatures, the attractive forces between molecules cause a real gas to deviate from ideal gas behavior. At high pressures, the finite size of the molecules causes a real gas to deviate from ideal gas behavior
Answer:.The ratio PV/nRT < 1 for one mole of a real gas because of repulsive interactions between the molecules.
Explanation:
The expression PV/nRT is referred to as the compressibility factor commonly designated as Z.
This compressibility factor (Z) for real gas is often less than 1. Z<1 means attraction forces are dominant in the system.
Hence, Z<1 implies attractive and not repulsive force dominance in the system.
What is the formula for finding the density of
an object?
Answer:
density = Mass / Volume
Explanation:
The definition of density of a substance is "the mass of the substance per unit of volume"
Which involves a quotient of the mass of the sample substance you have divided the volume it occupies, via the formula:
Density = Mass divided Volume = Mass / Volume
The formula for finding the density of an object is Density = Mass/volume.
Density is a physical property that measures the amount of mass per unit volume of a substance. It describes how compact or concentrated a substance is. Mathematically, density is calculated by dividing the mass of an object or substance by its volume.
Density is typically expressed in units such as grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³), depending on the units used for mass and volume. It can vary depending on its composition and temperature. Different substances have different densities.
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Can someone please help?
Answer:
b) c2h2
Explanation:
One of the isotopes of sulfur is represented as sulfur-35 or S-35. What does the number 35 signify? A. number of protons B. number of neutrons C. atomic number D. mass number
Answer:
D. Mass number
Explanation:
atomic number is constant since the number of protons and electrons is equal
number of protons is always the same as the number of electrons
the number of neutrons vary from the number of protons therefore causing the difference in mass numbers
Answer:
D. mass number
Explanation:
How does the automatic hammer convert gravitational potential energy into kinetic energy?
Answer:
Exolaiend in explanation section
Explanation:
First of all, the automatic hammer is used to drive nails into tight spaces where where we can't get a sufficient striking force if we are to use a normal regular hammer in driving the nail.
So the nail to be driven is lifted out of rest(it's position). The energy here is gravitational potential energy.
Now, when it is driven into the tight spaces, the gravitational energy would be converted to kinetic energy due to the motion and speed involved.
Mass of 500g and volume of 2500 cm3 what is the destiny
Answer:
The answer is
0.2 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 500 g
volume = 2500 cm³
The density is
[tex]density = \frac{500}{2500} = \frac{5}{25} = \frac{1}{5} \\ [/tex]
We have the final answer as
0.2 g/cm³Hope this helps you
is burning of maganisums exothermic or endothermic reaction
Answer:
Exothermic I think
Explanation:
In terms of the atmosphere, which of the following best describes the oxygen that is present?
It is the solvent in a homogeneous gas mixture.
It is the solute in a heterogeneous gas-liquid mixture.
It is the solvent in a heterogeneous mixture.
It is the solute in a homogeneous gas mixture.
A basic solution contains an excess of H^+ ions.
O True
O False
Answer:
true
Explanation:
Yes basic solutions also have H+ ions.
It is falseIt is ______ that when chloroform, C H C l 3 , is dissolved in water, a conducting solution results. This is because chloroform, C H C l 3 is a _____ that ______ support the movement of charge. that when chloroform, CHCl3 , is dissolved in water, a conducting solution results. This is because chloroform, CHCl3 is a nonelectrolyteIt is ______ that when chloroform, C H C l 3 , is dissolved in water, a conducting solution results. This is because chloroform, C H C l 3 is a ______ that _______ support the movement of charge. that does notIt is ______ that when chloroform, C H C l 3 , is dissolved in water, a conducting solution results. This is because chloroform, C H C l 3 is a ______ that ______ support the movement of charge. support the movement of charge.
Answer:
This question seems unclear as some fragments were repeated. However, the comprehensive question, in addition to the explained answers to fill the gap can be found in the explanation section. The answers are typed in BOLD.
Explanation:
It is _FALSE_ that when chloroform, CHCl3, is dissolved in water, a conducting solution results. This is because chloroform, CHCl3 is a _NON-ELECTROLYTE_ that _DOES NOT_ support the movement of charge.
In contrast to an electrolyte, a NON-ELECTROLYTE is a substance that does not ionize or dissociate into ions (charged atoms) when dissolved in water. Since they do not ionize, they also do not conduct electricity. An example is the Chloroform (CHCl3) described in this question.
Why do you think some minerals are easier to identify than others?
The largest source of power generated in the US is
A)
fossil fuel combustion.
B)
nuclear.
C)
solar.
D)
wind.
Answer:
A. fossil fuel combustion
Explanation:
What happens to a gas when heat is removed?
Answer: Heat is removed from a gas, and the substance becomes a liquid.
A solution containing a mixture of 0.0333 M0.0333 M potassium chromate ( K2CrO4K2CrO4 ) and 0.0532 M0.0532 M sodium oxalate ( Na2C2O4Na2C2O4 ) was titrated with a solution of barium chloride ( BaCl2BaCl2 ) for the purpose of separating CrO2−4CrO42− and C2O2−4C2O42− by precipitation with the Ba2+Ba2+ cation. The solubility product constants ( KspKsp ) for BaCrO4BaCrO4 and BaC2O4BaC2O4 are 2.10×10−102.10×10−10 and 1.30×10−61.30×10−6 , respectively.
A) Which barium salt will precipitate first? O BaC204 O BaCrO4
B) What concentration of Ba2+ must be present for BaCrO4 to begin precipitating? Number [Ba2+]=
C) What concentration of Ba is required to reduce oxalate to 10% of its original concentration? Number 2+
D) What is the ratio of oxalate to chromate (IC204CrO4) when the Ba2 concentration is 0.0050 M? Number C,O Cro,
Answer:
Explanation:
K₂CrO₄ + ( COONa )₂ + 2BaCl₂ = Ba CrO₄ + ( COO ) ₂ Ba + 2 KCl + 2 NaCl
.033 M .053 M
Ksp of Ba CrO₄ is 2.10×10⁻¹⁰
Ksp of ( COO ) ₂ Ba is 1.30×10⁻⁶
A ) Ksp of Ba CrO₄ is less so it will precipitate out first .
B) Ksp = 2.10×10⁻¹⁰
Ba CrO₄ = Ba⁺² + CrO₄⁻²
C .033
C x .033 = 2.10×10⁻¹⁰
C = 63.63 x 10⁻¹⁰ M
Ba⁺² must be present in concentration = 63.63 x 10⁻¹⁰ M
C)
90% of precipitation of barium oxalate
concentration of oxalate to precipitate out = .9 x .0532 = .04788
( COO ) ₂ Ba = (COO)₂⁻² + Ba⁺²
.04788 M C
C x .04788 = 1.30×10⁻⁶
C = 27.15 x 10⁻⁶ M .
Read this excerpt from Immigrant Kids. The second doctor watched for contagious and infectious diseases. He looked especially for infections of the scalp and at the eyelids for symptoms of trachoma, a blinding disease. Since trachoma caused more than half of all medical detentions, this doctor was greatly feared. He stood directly in the immigrant's path. With a swift movement, he would grab the immigrant's eyelid, pull it up, and peer beneath it. If all was well, the immigrant was passed on. The purpose of this excerpt is to provide information about eye doctors and to explain how they traveled the immigrant’s path. to provide information about eye disease and to explain its medical treatment. to provide information about scalp infections and to explain how they can be prevented. to provide information about trachoma and to explain how it was diagnosed among immigrants.
Answer:
i think its B
Explanation:
Answer:
Its is D
Explanation:
I took the test
How much energy is required to heat the solid iron from 1535 ∘C to 2000 ∘C?
Answer:
[tex]Q=206.46\frac{J}{g}[/tex]
Explanation:
Hello,
In this case, since the energy due to the change of temperature is computed via:
[tex]Q=mCp\Delta T[/tex]
Thus, since the specific heat of iron is 0.444 J/(g°C), the heat per unit of mass turns out:
[tex]Q=0.444\frac{J}{g\°C}(2000-1535)\°C\\ \\Q=206.46\frac{J}{g}[/tex]
Best regards.
"206.46 J/g" energy required to heat the solid iron.
Energy due to change in temperature:The movements or the activity of microscopic particles known as atoms, molecules, or ions in solids, solvents, as well as gases.
Thermal energy may go from one item towards the another one.
Given:
Temperature, [tex]T_1 = 1535[/tex]°C
[tex]T_2 = 2000[/tex]°C
Change, [tex]\Delta T = T_2-T_1[/tex]
We know the relation,
→ [tex]Q = mC_p \Delta T[/tex]
By putting the values,
[tex]= 0.444(2000-1535)[/tex]
[tex]= 206.46[/tex] J/g
Thus the answer above is right.
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Silicon carbide is an abrasive used in the manufacture of grinding wheels. A company is investigating whether they can be more efficient in the construction of such wheels by making their own via the following reaction. (a) If this reaction consistently has a yield of , what is the minimum amount (in ) of both silicon dioxide and carbon needed to produce of for the manufacture of cutting wheels? silicon dioxide kg carbon kg (b) The silicon dioxide is to be obtained from sand and the carbon is derived from coal. If the available sand is by weight and the coal is by weight, and assuming the other material does not interfere with the intended reaction, what mass of coal (in ) is needed for each metric ton of sand used? () kg
Answer:
A. Amount of SiO₂ = 102941.25 moles of SiO₂
Amount of C = 308823.75 moles of C
B. 0.712 metric tons of coal is required for every metric ton of sand
Note: The question is incomplete. the complete question is given below;
Silicon carbide is an abrasive used in the manufacture of grinding wheels. A company is investigating whether they can be more efficient in the construction of such wheels by making their own SiC via the reaction.
SiO₂ + 3C = SiC + 2CO
a. If this reaction consistently has a yield of 83%, what is the minimum amount of both silicon dioxide and carbon needed to produce 3500 kg of SiC for the manufacture of cutting wheels?
Amount of silicon dioxide = ? mol
Amount of carbon = ? mol
b. The silicon dioxide is to be obtained from sand and the carbon is derived from coal. If the available sand is 93% SiO2 by weight and the coal is 75% C by weight, what mass of coal is needed for each metric ton of sand used?
Mass of coal = ? metric tons
Explanation:
A. First the theoretical yield from the equation is determined
100/85* 3500 kg = 4117.65 kg = 4117650 g
molar mass of silicon dioxide = 28 + 2*16 = 60 g/mol; molar mass of carbon = 12g/mol; molar mass f SiC = 28 + 12 = 40 g/mol
40 g SiC is produced by 60 g of SiO₂
4117650 g of SiC will be produced by 4117650 * 60/40 g of SiO₂ = 6176475 g of SiO₂ = 6176.475 kg of SiO₂
Amount in moles = 6176475 g / 60 g/mol = 102941.25 moles of SiO₂
40 g SiC is produced by 3 * 12 g of C = 36 g of C
4117650 g of SiC will be produced by 4117650 * 36/40 g of C = 3705885 g of C = 3705.885 kg of C
Amount in moles = 3705885 g / 12 g/mol = 308823.75 moles of C
B. I metric tonne = 1000 kg
amount of sand required = 100/93 * 6176.475 kg = 6641.37 kg = 6.64 tonnes
amount of coal required = 100/75 * 3705.885 kg = 4941.18 kg = 4.94 tonnes
ratio of coal to sand = 4.94/6.64 = 0.712
Therefore, 0.712 metric tons of coal is required for every metric ton of sand
Which of the following is true?
O The exact position of an electron can be known.
O Electron clouds have the same energy levels.
O Electrons in a cloud have probable locations.
O Electrons are positively charged.
Answer:
B. O The electron cloud have the same energy levels.
