Answer:
m=621.54g
Explanation:
number of moles= mass of H2O/molar mass of H2O
n=m/mm
make mass the subject of the formula
m=n*mm
find molar mass of water
H2O=1(16)+2(1)
mm= 18.0g/mol. n=34.53mol
hence, m=34.53mol*18.0g/mol
m=621.54g
The United States National Weather Service reports pressure in mm of Hg. What's the pressure of 725 mmHg in Pa, millibars, and Torr?
A. 101.325 Pa, 966 millibar, 725 Torr
B. 100,000 Pa, 1000 millibar, 760 Torr
C. 96,657 Pa, 966 millibar, 725 Torr
D.100.000 Pa, 760 millibar. 725 Torr
Answer:
C. 96,657 Pa, 966 millibar, 725 Torr
Explanation:
The pressure of 725 mmHg in Pa, millibars, and Torr is 96,657 Pa, 966 millibar, 725 Torr. Hence option C is correct.
What is pressure?Pressure is defined as the force that is applied perpendicularly to an object's surface in relation to the area that it is dispersed over. Pressure can actually be a very good thing. Stress only occurs and has a fully negative impact when it continues to grow and that sensation of serenity and order is replaced with one of being out of control.
Given pressure = 725 mmHg
1 mmHg = 133.32 Pa
725 mmHg = 133.32 x 725 Pa
= 96,657 Pa
1 mmHg = 1.333 millibar
725 mmHg = 725 x 1.333 millibar
= 966 millibar
1 mmHg = 1 torr
725 mmHg = 725 Torr
Thus, the pressure of 725 mmHg in Pa, millibars, and Torr is 96,657 Pa, 966 millibar, 725 Torr. Hence option C is correct.
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___C3H8 + ___O2 --> ___H2O + ___CO2
Answer:
C3H8 + 5O2 ‐‐‐‐‐‐‐‐> 4H2O + 3CO2
Which is one piece of information that "9” gives about an atom of fluorine?
The atomic mass is different than the atomic number, and the number of neutrons is the difference between the atomic mass and the atomic number.
the atomic number
the atomic mass
the mass of protons
the number of neutrons
Answer:
The Atomic Number
Explanation:
2.92 x 10^-15/
(5.6 x 10^-3) (4.16 x 10^9)
Answer:
3645.46
Explanation:
calculated
How do you know whether or not a chemical
reaction equation follows the law of
conservation of mass?
Answer:
- Because it has or not the same number of atoms at each side.
- Because the mass of reactants and product is or not the same after the reaction.
Explanation:
Hello!
In this case, since the law of conservation of mass states that matter cannot be created nor destroyed; when we see a chemical reaction, we need to make sure that the amount of atoms is the same at both reactants and products; for instance the formation of water requires four hydrogen atoms and two oxygen atoms at both reactants and products sides as shown below:
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Another way is by proving that the total mass of products equals the total mass of reactants once the reaction has gone to completion.
Best regards!
How does knowing the reactants and products
help you classify a chemical reaction? Write a
short paragraph explaining.
Answer:
Here's the Sample Response: The reactants and products determine the type of chemical reaction. If there are more products than reactants, then it is a decomposition reaction. If there are more reactants than products, it is a synthesis reaction. If oxygen is a part of the reactant, it is a combustion reaction. If one ion replaces another, it is a single replacement reaction. If there are two compounds in a reactant where cations switch, it is a double replacement reaction.
Explanation:
the presidential inauguration is free to watch with or without paying ror traditional tv service. Why is this important?
Answer:
so that people would be able to witness the inauguration of a president, since a president is an important part of a country.
Explanation:
100 grams of calcium were dropped into 100 grams of water. How many grams of calcium hydroxide would be produced?
Answer:
100
Explanation:
A piece of glass has a temperature of 83˚C. Liquid that has a temperature of 43˚C is poured over the glass, completely covering it, and the temperature at equilibrium is 53˚C. The mass of liquid and glass is the same. If the specific heat of glass is 840 J/(kg˚C), determine the specific heat of the liquid.
Answer: The specific heat of the liquid is [tex]2520J/kg^0C[/tex]
Explanation:
[tex]heat_{absorbed}=heat_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
.................(1)
where,
q = heat absorbed or released
= mass of glass = x kg
= mass of liquid = x kg
= final temperature =
[tex]T_1[/tex] = temperature of glass = [tex]83^oC[/tex]
[tex]T_2[/tex] = temperature of liquid = [tex]43^oC[/tex]
[tex]c_1[/tex] = specific heat of glass = [tex]840J/kg^0C[/tex]
[tex]c_2[/tex] = specific heat of liquid= ?
Now put all the given values in equation (1), we get
[tex]-[(x\times 840\times (53-83)]=x\times c_2\times (53-43)[/tex]
[tex]c_2=2520J/kg^0C[/tex]
Therefore, the specific heat of the liquid is [tex]2520J/kg^0C[/tex]
calculate the molar mass of iron oxide
Explanation:
The molar mass of iron oxide is 159.7 ghope it helps you
12-How many elements are in the mixture pictured below?
A-7
O B-4
C-3
D-2
In the image shown above, there are 3 elements (option C).
What is an element?Element is one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.
As stated above, all elements are made up of backbone structures called atoms. The atoms of an element are the same.
According to this question, an image is given showing atoms of different colors. Each atom with the same color belongs to a single element.
Since there are there colors, this means that there are three elements in the picture.
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One mole of a substance has a different number of particles as one mole of another substance.
O True
O False
g The emission line with the longest wavelength. 2.) The absorption line with the shortest wavelength. 3.) The emission line with the highest energy. b 4.) The absorption line with the highest energy. a 5.) The emission line with the lowest frequency. a 6.) The line corresponding to the ionization energy of hydrogen.
The complete question is shown in the image attached to this answer.
Answer:
a) 4
b) 2
c) 5
d) 2
e) 4
f) 3
Explanation:
It is a fact that shorter the wavelength implies greater energy. Among the emission lines, the greatest energy and shortest wavelength is 4.
From the same perspective as above, we can see that the greatest energy catapults the electron from energy level n=1 to n=4. This now corresponds to the shortest wavelength since energy is known to be inversely proportional to wavelength.
Frequency is inversely related to wavelength when waves are travelling at the same speed. Thus, a transition corresponding to the highest energy and shortest wavelength in the emission spectrum will have the highest frequency.
The emission line with the lowest energy is found at the line in which the electron moves from n=2 to n=1.
The ionization energy is the energy required to entirely remove the electron from the influence of the nucleus of the hydrogen atom. It corresponds to the transition n=1 to n=∞
11-Which of the following would NOT be a Compound?
A?
B?
C?
D?
Answer:
A because it is not small enough
Explanation:
It's a of c Yea a or so pick that
A 4.0g Glass was heated from 5°C to 45°C after absorbing 32 J of heat. What is the specific heat of the glass? 
Answer:
[tex]c=0.2\ J/g^{\circ} C[/tex]
Explanation:
Given that,
Mass of a glass, m = 4 g
Initial temperature, [tex]T_i=5^{\circ} C[/tex]
Final temperature, [tex]T_f=45^{\circ} C[/tex]
Heat absorbed, Q = 32 J
We need to find the specific heat of the glass. The formula for the heat absorbed is given by :
[tex]Q=mc\Delta T\\\\c=\dfrac{Q}{m\Delta T}\\\\c=\dfrac{32\ J}{4\ g\times (45-5)^{\circ} C}\\\\=0.2\ J/g^{\circ} C[/tex]
So, the required specific heat of the glass is [tex]0.2\ J/g^{\circ} C[/tex].
How many moles of Aluminum are produced when34.2 g of alumina are broken down through the process of electrolysis
Answer:
0.670 mol
Explanation:
Step 1: Write the balanced reaction for the decomposition of alumina
2 Al₂O₃ ⇒ 4 Al + 3 O₂
Step 2: Calculate the moles corresponding to 34.2 g of Al₂O₃
The molar mass of Al₂O₃ is 101.96 g/mol.
34.2 g × 1 mol/101.96 g = 0.335 mol
Step 3: Calculate the moles of Al produced from 0.335 moles of Al₂O₃
The molar ratio of Al₂O₃ to Al is 2:4.
0.335 mol Al₂O₃ × (4 mol Al/2 mol Al₂O₃) = 0.670 mol Al
What does it mean to be an invertebrate?
invertebrate is a animal that does not have a back bone but may have a exoskeleton examples could be earthworm, jellyfish, snail and a spider because it has a exoskeleton a hard outer shell hope this helps
Vertebrates have a back bone like sea turtles , fish ,foxes and humans.
please helpppppppppp
Answer:
Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles
And the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately affects the animal's phenotype.
675 g of carbon tetrabromide is equivalent to how many
mol. Make sure to round your answer to the nearest WHOLE NUMBER
2.04 mol CBr₄
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Organic
Writing Organic CompoundsWriting Covalent CompoundsOrganic PrefixesAtomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
675 g CBr₄
Step 2: Identify Conversions
Molar Mass of C - 12.01 g/mol
Molar Mass of Br - 79.90 g/mol
Molar Mass of CBr₄ - 12.01 + 4(79.90) = 331.61 g/mol
Step 3: Convert
[tex]\displaystyle 675 \ g \ CBr_4(\frac{1 \ mol \ CBr_4}{331.61 \ g \ CBr_4}) = 2.03552 \ mol \ CBr_4[/tex]
Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2.03552 mol CBr₄ ≈ 2.04 mol CBr₄
Answer:
[tex]\boxed {\boxed {\sf About \ 2.04 \ moles \ of \ CBr_4}}[/tex]
Explanation:
1. Define Formula
The compound is carbon tetrabromide. The tetra indicates 4 atoms of bromine.
Carbon (C)+ 4 Bromine (Br) = CBr₄2. Find Molar Mass
There are 2 elements in this compound: carbon and bromine. Use the Periodic Table to find the molar masses of these elements.
Carbon (C): 12.011 g/mol Bromine (Br): 79.90 g/molThe molar mass is based on the number of atoms in the compound. The compound has 1 atom of carbon and 4 atoms of bromine.
CBr₄= 1(12.011 g/mol) + 4(79.90 g/mol)
= 12.011 g/mol+319.60 g/mol = 331.611 g/mol
3. Convert Grams to Moles
We want to convert 675 grams to moles. We should use the molar mass as a fraction.
[tex]\frac{331.611 \ g \ CBr_4}{1 \ mol \ CBr_4 }[/tex]
Multiply by the given number of grams.
[tex]675 \ g \ CBr_4 *\frac{331.611 \ g \ CBr_4}{1 \ mol \ CBr_4 }[/tex]
Flip the fraction so the grams of CBr₄ will cancel.
[tex]675 \ g \ CBr_4 *\frac{1 \ mol \ CBr_4 }{331.611 \ g \ CBr_4}[/tex]= [tex]675 \ *\frac{1 \ mol \ CBr_4 }{331.611 \ }[/tex]
[tex]\frac{675 \ mol \ CBr_4 }{331.611 \ }[/tex] = [tex]2.03551752 \ mol \ CBr_4[/tex]
4.Round
The original measurement, 675 grams has 3 significant figures (6,7 and 5), so our answer must have the same.
For the answer we found, 3 sig figs is the hundredth place.
[tex]2.03551752 \ mol \ CBr_4[/tex]
The 5 in the thousandth place tells us to round the 3 to a 4.
[tex]\approx 2.04 \ mol \ CBr_4[/tex]
There are about 2.04 moles of carbon tetrabromide in 675 grams.
A 15 L tank is filled with oxygen gas for use in a hospital. How many grams of O2, is inside the tank if the pressure is 75 psi at 28°C?
Answer:
Mass = 99.2 g
Explanation:
Given data:
Volume of oxygen = 15 L
Mass of oxygen = ?
Pressure of oxygen = 75 psi ( 75/14.696 = 5.10 atm)
Temperature of oxygen = 28°C (28+273 = 301 K)
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
n = PV/RT
n = 5.10 atm× 15 L / 0.0821 atm.L/ mol.K × 301 K
n = 76.5 atm.L/24.71 atm.L/ mol
n = 3.1 mol
mass of oxygen:
Mass = number of moles × molar mass
Mass = 3.1 mol × 32 g/mol
Mass = 99.2 g
1. inspiration meaning
Answer:
inspiration means
the process of being mentally stimulated to do or feel something, especially to do something creative.
Answer:
The process of being mentally stimulated to do or feel something, especially to do something creative.
g Suppose a 49. L reaction vessel is filled with 1.5 mol of NO. What can you say about the composition of the mixture in the vessel at equilibrium
The question is incomplete, the complete question is:
At a certain temperature, the equilibrium constant [tex]K_{eq}[/tex] for the following reaction is 0.74:
[tex]NO_3(g)+NO(g)\rightleftharpoons 2NO_2(g)[/tex]
Suppose a 49.0 L reaction vessel is filled with 1.5 mol of [tex]NO_3[/tex] and 1.5 mol of NO. What can you say about the composition of the mixture in the vessel at equilibrium?
A. There will be very little [tex]NO_3[/tex] and NO.
B. There will be very little [tex]NO_2[/tex]
C. Neither of the above is true.
Answer: The correct option is B. there will be very little [tex]NO_2[/tex]
Explanation:
We are given:
Initial moles of [tex]NO_3[/tex] = 1.5 moles
Initial moles of NO = 1.5 moles
Volume of vessel = 49 L
As, moles of reactants and moles of products are equal, the volume term will not appear in the equilibrium constant expression.
Equilibrium constant for the reaction = 0.74
For the given chemical equation:
[tex]NO_3(g)+NO(g)\rightleftharpoons 2NO_2(g)[/tex]
Initial: 1.5 1.5 -
At eqllm: 1.5-x 1.5-x 2x
The expression of equilibrium constant for the above reaction:
[tex]K_{eq}=\frac{[NO_2]^2}{[NO_3]\times [NO]}[/tex]
Putting values in above equation, we get:
[tex]0.74=\frac{(2x)^2}{(1.5-x)(1.5-x)}\\\\x=-1.13, 0.451[/tex]
Neglecting the negative value of equilibrium constant because concentration cannot be negative
Equilibrium concentration of [tex]NO_3[/tex] = (1.5 - x) = (1.5 - 0.451) = 1.049 moles
Equilibrium concentration of NO = (1.5 - x) = (1.5 - 0.451) = 1.049 moles
Equilibrium concentration of [tex]NO_2[/tex] = 2x = [tex](2\times 0.451)=0.902mol[/tex]
There are 3 possibilities:
If [tex]K_{eq}<1[/tex], the reaction is reactant favoredIf [tex]K_{eq}>1[/tex], the reaction is product favored.If [tex]K_{eq}=1[/tex], the reaction is in equilibrium.Here, the value of [tex]K_{eq}=0.74[/tex], which is less than 1, therefore the reaction is reactant favored and we can say that there will be very little [tex]NO_2[/tex].
Hence, the correct option is B. there will be very little [tex]NO_2[/tex]
Which of these factors are biotic? (SELECT ALL THAT APPLY.)
animals
light
minerals
water
plants
Answer:
plants
Explanation:
because it produces ( i am a third grade student and don't know if it is right or not)
Hydrogen bromide is a chemical compound. It’s formed from atoms of hydrogen and bromide, two
A
electrons.
B
elements.
C
neutrons.
D
nuclei.
Answer: The correct option is B. elements.
Explanation:
A chemical compound is defined as the specie which is formed by the combination of two or more elements. For example: Water, carbon dioxide, etc..
Elements is defined as the chemical specie which consists of only one type of atom. For example: Hydrogen, Oxygen, etc..
Now, when hydrogen element and bromine element combines, it leads to the formation of a heteronuclear chemical compound known as hydrogen bromide having chemical formula HBr.
Hence, the correct option is B. elements.
Hydrogen and bromine are two elements that form hydrogen bromide (HBr).
COMPOUND:
A compound is a chemical substance made up of chemical combination of two or more elements. According to this question, Hydrogen bromide is a chemical compound formed from atoms of hydrogen (H) and bromine (Br). These two atoms that make up hydrogen bromide are that of elements. Therefore, it can be said that hydrogen and bromine are two elements that form hydrogen bromide (HBr).Learn more at: https://brainly.com/question/13516179?referrer=searchResults
curicun, named for marie curie, has approximately 25 different isotopes that emit an alpha particle when their nuclei decay. if curium-247, the most abundant nuclide, emit and alpha particle, what daughter nuclide is formed?
A. Californium-251
B. Plutonium-243
C. Californium-249
D. Plutonium-251
Answer:
Option B. Plutonium-243
Explanation:
To know the the correct answer to the question, we shall write the balanced equation for the reaction showing curium-247 (²⁴⁷Cm) emitting alpha particle. This is illustrated below:
²⁴⁷₉₆Cm —> ᵐₙX + ⁴₂He
Next, we shall determine m, n and X. This can be obtained as follow:
247 = m + 4
Collect like terms
247 – 4 = m
243 = m
Thus, m is 243
96 = n + 2
Collect like terms
96 – 2 = n
94 = n
Thus, n is 94
m = 243
n = 94
ᵐₙX => ²⁴³₉₄X => ²⁴³₉₄Pu
Thus, the equation is:
²⁴⁷₉₆Cm —> ²⁴³₉₄Pu + ⁴₂He
From the illustrations above, the daughter nuclei formed is Plutonium-243 (²⁴³₉₄Pu)
Answer:
Plutonium-243
Explanation:
Consider this reaction: 2HgO→2Hg+O2 .
Which of the following is the best explanation for why this reaction is a decomposition reaction?
Question 5 options:
Because it is balanced
Because oxygen is one of the reactants
Because there are two products
Because there is only one reactant
Answer:
becous thear are two products
Explanation:
The statement is "Because there is only on reactant."
What is reactant?Reactant are raw materials that react with one another and form products.
What is decomposition reaction?
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks into two or more product.
Hence the correct explanation about the reaction is "because there is only one reactant"
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I will go to the app and give you brainly Est if u answer correctly ASAPPPPP
Answer:
C
Explanation:
I think it is C
How do we use positive and negative signs to communicate the direction of a vector
Answer:
Two vectors are equal if they have the same magnitude and the same direction. Just like scalars which can have positive or negative values, vectors can also be positive or negative. A negative vector is a vector which points in the direction opposite to the reference positive direction.
What is one way in which sound and light are alike? PLEASE HELP IF YOU WANT BRAINLEIST AND TO HAVE YOUR COMMENT LIKED!!
A. They both travel easily through wood.
B. They are both types of energy.
C. both can travel through outer space.
D. They both make it easier for you to see what you are doing.
Answer:
They are both types of energy.
Explanation:
The last 2 are true for light, and the first one is true for sound.
Hope this is right, sorry if it is not.
A light bulb consumes energy at a rate of 80
joules per second . How long in
seconds will it take for the light bulb to consume 2.30 ~ 105
in energy?
Answer:
2875 s
Explanation:
From the question given above, the following data were obtained:
Power (P) = 80 J/s
Energy (E) = 2.3×10⁵ J
Time (t) = ?
Power can simply be defined as the rate at which energy is used. Mathematically, power is expressed as:
Power = Energy / time
P = E/t
With the above formula, we can obtain the time taken for the bulb to consume 2.3×10⁵ J. This can be obtained as follow:
Power (P) = 80 J/s
Energy (E) = 2.3×10⁵ J
Time (t) = ?
Power = Energy / time
P = E/t
80 = 2.3×10⁵ /t
Cross multiply
80 × t = 2.3×10⁵
Divide both side by 80
t = 2.3×10⁵ / 80
t = 2875 s
Therefore, it will take 2875 s for the bulb to consume 2.3×10⁵ J of energy.
