The molar mass of gas = 238.29 g/mol
Further explanationGiven
mass = 81.5 g
P=1.75 atm
V=4.92 L
T=307 K
Required
molar mass
Solution
The gas equation can be written
[tex]\large{\boxed{\bold{PV=nRT}}[/tex]
[tex]\tt n=\dfrac{mass}{molar~mass}[/tex]
So the equation becomes :
[tex]\tt Molar~mass=\dfrac{mRT}{PV}[/tex]
Input the value :
[tex]\tt M=\dfrac{81.5\times 0.082\times 307}{1.75\times 4.92}\\\\M=238.29~g/mol[/tex]
Answer:
239
Explanation:
What type of reaction is FeS + 2HCl àFeCl2 + H2S?
Answer: 3 4 a noodles
Explanation: just is[tex]\lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \lim_{n \to \infty} a_n \left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right] \sqrt{x} x^{2} x^{2}[/tex]
2.
and chemical equation
k. Molarity, normality, molality and formality
What mass of CH4 in grams, is required to react with 96.0 grams of O2?(2points)
S. A 15.6 g sample of benzene is mixed with excess nitric acid. We isolate 18.0 g of
C6H5NO2. What is the percent yield of C6H5NO2 in this reaction? (2points)
4. Calculate the volume of a 0.225 M solution of potassium hydroxide, KOH,
required to react with 0.215 g of acetic acid, CH3COOH? (2points)
5. An excess of AgNO3 reacts with 185.5 mL of an AlCl3 solution to give 0.325 g
of AgCl. What is the concentration, in moles per liter, of the AlCl3 solution?
(2 points)
6. Calculate the volume of pure water that used to dilute 100. mL of 12 M NaOH to
4.75 M. (2points)
3
2 16
&
Answer:
See explanation
Explanation:
2)CH4 + 2O2 -------> CO2 + 2H2O
96g of O2 = 96g/32g/mol = 3 moles of O2
If 1 mole of CH4 reacts with 2 moles of O2
x moles of CH4 reacts with 3 Moles of O2
x = 3/2 = 1.5 moles of CH4
Mass of CH4 = 1.5 moles * 16 = 24 g of CH4
3)C6H6 + HNO3 ---->C6H5NO2 + H2
Number of moles in 15 g of benzene = 15 g/ 78 g/mol = 0.19 moles
Number of moles of 18 g of C6H5NO2 = 18g/123 g/mol = 0.15 moles
From the reaction equation;
1 mole of C6H6 yields 1 mole of C6H5NO2
Hence 0.19 moles of C6H6 also yields 0.19 moles of C6H5NO2
% yield = actual yield/ theoretical yield * 100
actual yield = 0.15 moles
Theoretical yield = 0.19 moles
% yield = 0.15/0.19 * 100
% yield = 78.9%
4)The reaction equation is
KOH + CH3COOH ------> CH3COOK + H2O
number of moles of acetic acid reacted = 0.215g/60 g/mol = 3.58 * 10^-3 moles
Since the reaction is 1:1, 3.58 * 10^-3 moles moles of KOH is used.
But;
n = CV
n = number of moles
C = concentration of reactants
V = volume of solution
V = n/C
V= 3.58 * 10^-3 moles/0.225M = 0.016 L
5) 3AgNO3 + AlCl3 -----> Al(NO3) + 3AgCl
Number of moles in 0.325 g of AgCl = 0.325g/143 g/mol = 2.27 * 10^-3 moles
From the reaction equation;
1 mole of AlCl3 yields 3 moles of AgCl
x moles of AlCl3 yields 2.27 * 10^-3 moles of AgCl
x = 2.27 * 10^-3 moles/3
x = 7.6 * 10^-4 moles
From;
n = CV
C = n/V
C = 7.6 * 10^-4 moles * 1000/185.5
C= 4.1 * 10^-3 MolL-1
6)From;
C1V1 =C2V2
Where;
C1 = initial concentration
V1= initial volume
C2= final concentration
V2= final volume
100 * 12 = 4.75 * V2
V2 = 100 * 12/4.75
V2 = 252.6 ml
Volume of water added = 252.6 - 100 = 152.6 ml of pure water
An aqueous solution contains
32.7% KCI (weight/weight %).
What is the mole fraction of KCI in
this aqueous solution?
Molar Mass
KCI: 74.55 g/mol
H2O: 18.016 g/mol
The mole fraction of KCl = 0.105
Further explanationGiven
%w/w KCl = 32.7
Required
the mole fraction of KCI
Solution
For 100 g solution : KCl = 32.7 g, H₂O = 67.3 g
mol KCl :
[tex]\tt \dfrac{32.7}{74.55~g/mol}=0.439[/tex]
mol H₂O :
[tex]\tt \dfrac{67.3}{18.016}=3.74[/tex]
total mol of solution = 0.439+3.74=4.179
mol fraction of KCl :
[tex]\tt \dfrac{0.439}{4.179}=0.105[/tex]
Answer:
32.7
Explanation:
1. In the above reaction, the reactants are
and
Answer:
PLZZ like it tuk me to long to explan
Explanation:
The reaction between zinc and sulfur can be shown in what is called a chemical equation . In words, we could write the reaction as:
zinc + sulfur → zinc sulfide
The more convenient way to express a chemical reaction is to use the symbols and formulas of the substances involved:
Zn + S → ZnS
The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction. In the equation above, the zinc and sulfur are the reactants that chemically combine to form the zinc sulfide product.
There is a standard way of writing chemical equations. The reactants are all written on the left-hand side of the equation, with the products on the right-hand side. An arrow points from the reactants to the products to indicate the direction of the reaction:
reactants → products
When appropriate, a symbol may be written above or below the arrow to indicate some special circumstance. The symbol “Δ” is often used to indicate that the reaction is to be heated.
The presence of the arrow also indicates that the reaction goes in one direction under the conditions indicated. There are reactions which can be easily reversed, but we will not take those up right now.
There are a wide variety of reactions possible: elements may form compounds (as seen in the reaction above), compounds may form elements (water will break down in the presence of an electric current to form hydrogen gas and oxygen gas) or compounds may combine, break apart, or rearrange to form new materials.
if water does break down by electrolysis to form a new substance what might form
Answer:
When an electric current is passed through liquid water (H2O), it changes the water into two gases—hydrogen and oxygen. The molecules of water break apart into individual atoms.
hope this helps
help pls this is rocks and minerals fell free to zoom in!!!
Answer:rocks
Explanation:
How many moles are in 68 grams of Mg(OH)
Answer:
1.16 mol
Explanation:
Given data:
Mass in gram Mg(OH)₂ = 68 g
Number of moles of Mg(OH)₂ = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of Mg(OH)₂ = 58.32 g/mol
By putting values,
Number of moles = 68 g/ 58.32 g/mol
Number of moles = 1.16 mol
What is a symbol? Write with examples.
Answer:element symbol
Explanation:
An element symbol is the one or two letter sequence to at identifies an element, typically used through the periodic table
Symbols are abbreviations used in chemistry for chemical elements, functional groups and chemical compounds.
example:
H, Cl ,N , Ne etc.
HELP!!
In the EXPLORE section of your lesson 4.08 on Potential energy there were several animations to watch that provided a graphic illustrating how the PE and KE in a system changed as skateboarder rides a pipeline or a pendulum moves, why did the bar for the total energy remain constant?
Question 1 options:
A. Because these models do not take into account the impact of friction and air resistance and are helping to solidify the concept of energy conservation and that the total mechanical energy remains constant in that model.
B. This is because no energy is being created or destroyed in this system.
C. Energy is converted from kinetic to potential and potential to kinetic, but the total amount of energy is conserved.
D. all answers given are correct
Answer: In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
Explanation:
what does wave do?
a. Waves transfer matter from one place to another place.
b. Waves transfer energy
c. Waves create energy
d. Waves are all the same.
Answer:
b
Explanation:
wave transfers energy from one place to another
What happens to matter when it reaches absolute zero?
Two solutions initially at 24.60°C are mixed in a coffee cup calorimeter. when a 100.0 ml volume of 0.100 m AgNO3 solution is mixed with a 100.0 ml sample of 0.200 m nacl solution, the temperature in the calorimeter rises to 25.30°C. Determine the dh for the reaction as written below. Assume that the density and heat capacity of the solutions is the same as that of water.
NaCl(aq)+AgNO3(aq) → AgCl(s)+NaNO3(aq)
a. -69 kJ
b. -35 kJ
c. -16 kJ
d. -250 kJ
Answer:
= - 59.7 kJ/mol
Explanation:
From the given information:
no of moles of AgNO3 = 100/1000 × 0.100 = 0.01 mol
no of moles of NaCl = 100/1000 × 0.200 = 0.02 mol
The total volume of the solution is:
= (100 + 100 ) mL
= 200 mL
mass of the solution = 200 × 1.00 = 200 g
Heat gained by the solution:
= mass × specific heat × temperature change in solution
= 200× 4.184 × (25.3 - 24.6)
= 585.76 J
Heat gained by calorimeter
= heat capacity × change in temperature of caiorimeter
= 15.5 × (25.3 -24.6)
= 10.85 J
Thus, total heat released = total heat gained
Q = 585.76 + 10.85 J
Q = 596.61 J
From above, it is obvious that AgNO3 is the limiting reagent
∴
ΔH_{rxn} = total heat released/ moles of AgNO3
= -596.61/0.01
= 59661 J/mol
= - 59.7 kJ/mol
courtroom
Me: If I throw sodium chloride in someone’s eye, is that against the law?
Judge: That would be assault
Me: Yes, I know its a salt but is it against the law?
There are no typos, this is a intended pun joke
Answer:
The worldly answer is 42
Explanation:
there you go
How do organisms like humans grow?
by increasing the number of organs
by increasing the size of their organelles
by increasing the size of cells
by increasing the number of cells
Many first aid kits include an instant cold pack. A cold pack utilizes a chemical reaction that has a significant change in energy in order to make the pack feel cold. Explain which type of reaction, an endothermic reaction or an exothermic reaction, would be most useful for making a cold pack.
Answer:
Endothermic reaction
Explanation:
A cold pack is used as a cold compress in order to numb pain caused by minor injuries. it is useful in first aid treatment of bruises, sprains, cuts and burns in addition to the application of a bandage.
A cold pack functions by absorbing heat away from the surrounding thereby decreasing the temperature and making the surface to feel cool. This is an endothermic reaction.
In an endothermic reaction, heat is absorbed from the environment and the reaction surface feels cool. Hence, an endothermic reaction is most useful in making a cold pack because the product of the endothermic reaction will feel cool to touch making it suitable to be used as a cold pack in first aid.
HELP ASAP!
Very Active Metal + Water - Metal Hydroxide + ?
Which of these completes this reaction?
Oxygen
Air
Hydrogen
Metal Oxide
Answer:
The elements toward the bottom left corner of the periodic table are the metals that are the most active in the sense of being the most reactive. Lithium, sodium, and potassium all react with water, for example.
Explanation:
What is the complete balanced equation for the reaction
between magnesium hydroxide and hydrogen chloride to
produce magnesium chloride and water is
O MgOH + HCI → MgCl + H2O.
O Mg(OH)2 + 2HCl → MgCl2 + 2H20.
O Mg(OH)2 + HCl → Mg + 2CO2 +3H20.
O Mg(OH)2 + 2HCl → MgCl2 + H2 + O2.
Answer:
[tex]mg(oh) {}^{2} + 2hcl) \\ gives \\ \: mgcl2 + 2h {}^{2}o[/tex]
[tex]option. b \: is \: the \: correct \\ \: balanced \: equation[/tex]
explain why benzoic acid is insolube in water at room temperature but is soluble in 2.5M NaOH solution
Answer:
It is known generally that polar compounds are soluble in polar solvents. Based on the structure of benzoic acid, it comprises the non-polar C6H6 group and polar COOH group. Based on the structure, in benzoic acid, the nonpolar hydrocarbon outweighs and influences the polar part as nonpolar, due to which benzoic acid is not soluble in water.
On the other hand, benzoic acid produces sodium salt benzoic acid when it reacts with 2.5 M sodium hydroxide, this salt is ionic. Generally, the ionic compounds are soluble in water. Therefore, the salt of benzoic acid gets dissolved in water. Hence, benzoic acid is soluble in the solution of sodium hydroxide.
draw two lewis structures for a compound with the formula c2h6o and compare the boiling points of the two molecules
Answer:
See explanation and images attached
Explanation:
There are two compounds that could have molecular formula of C2H6O, they are ethanol and methoxy methane (trivial name: methyl ether). The structures of the two compounds are shown in the image attached as obtained from quora.
The boiling point of methoxymethane is -24.8°C while that of ethanol is about 78.5°C. The reason for the high boiling point of ethanol is the presence of intermolecular hydrogen bonding leading to a stronger intermolecular interaction compared to methoxymethane molecules held together only by very weak dispersion forces.
The Lewis structures of ethanol and methoxymethane are attached below.
Ethanol (C₂H₆O) and methoxymethane (CH₃OCH₃) are both organic compounds, but they have different molecular structures and intermolecular forces, which can affect their boiling points.
Due to the presence of hydrogen bonding in ethanol, its boiling point is significantly higher compared to methoxymethane. The boiling point of ethanol is around 78.3°C (173°F), while the boiling point of methoxymethane is approximately -24.8°C (-12.6°F). The difference in boiling points arises from the stronger intermolecular forces, namely hydrogen bonding, present in ethanol.
Learn more about Lewis's structure, here:
https://brainly.com/question/29756546
#SPJ6
P4+ __02_ P4010
I need help ASAP
Answer:
[tex]P_4+5O_2\rightarrow P_4O_{10}[/tex]
Explanation:
Hello!
In this case, when we want to balance chemical reactions such as in this case, the idea is to equal to number of atoms of each element at each side of the equation according to the lay of conservation of mass, just as shown below:
[tex]P_4+5O_2\rightarrow P_4O_{10}[/tex]
Because we have four phosphorous and ten oxygen atoms at each side.
Best regards!
Which process is responsible for causing this column of rock to form?
A)crystallization
B)deposition
C)sedimentation
D)weathering
Answer:
I think it's sedimentation
To solve such this we must know the concept of chemical reaction. Therefore, the correct option is option C. Sedimentation is the process which is responsible for causing this column of rock to form.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.
There are so many types of chemical reaction reaction like combination reaction, double displacement reaction. Among all the given processes, sedimentation is the process which is responsible for causing this column of rock to form. Weathering is erosion upper layer of soil.
Therefore, the correct option is option C.
Learn more about the chemical reactions, here:
https://brainly.com/question/3461108
#SPJ2
Plzzz figure out at least the first one
whoever answers my question correctly I'll give 50 points
Answer:
okii is it on your page
Explanation:
Answer:
hello
Explanation:
Tom looks very different from his parents he has brown eyes and his parents have blue eyes is he adopted??
Answer:
no he don't have to be adopted he just different from his parents
YOO THIS DUE IN 2 MINUTES PLS HELP!!..
Answer:
C) There are fewer particles in the balloons than were in the cylinder.
Explanation:
Hope this helps good luck!- Angel
The nucleoside adenosine exists in a protonated form with a pKa of 3.8. The percentage of the protonated form at pH 4.8 is closest to:
Answer:
Ok:
Explanation:
So, you can use the Henderson-Hasselbalch equation for this:
pH = pKa + log([tex]A^-/HA[/tex]) where A- is the conjugate base of the acid. In other words, A- is the deprotonated form and HA is the protonated.
We can solve that
1 = log([tex]A^-/HA\\[/tex]) and so 10 = [tex]A^-/HA[/tex] or 10HA = A-. For every 1 protonated form of adenosine (HA), there are 10 A-. So, the percent in the protonated form will be 1(1+10) or 1/11 which is close to 9 percent.
Nucleoside is "a structural subunit of nucleic acids, the heredity-controlling components of all living cells, consisting of a molecule of sugar linked to a nitrogen-containing organic compound".
What are nucleic acids?Nucleic acids are "naturally occurring chemical compounds that serve as the primary information-carrying molecules in cells".
What is nitrogen?Nitrogen is "an essential element for all forms of life and is the structural component of amino acids from which animal and human tissues, enzymes, and many hormones are made".
What is organic compound?Organic compound is "any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen".
Using Henderson-Hasselbalch equation
pH = pKa + log(A⁻/HA)
where pH is the concentration of [H⁺]
pKa is the acid dissociation constant and [A⁻] and [HA] are the concentrations of conjugate base and an acid.
1 = log (A⁻/HA)
Thus, 10 = A⁻/HA
10HA = A⁻ Each protonated form of adenosine (HA) contains 10 A⁻
Hence, the percentage of the protonated form at pH 4.8 will be 1(1+10) or 1/11 which is closer to 9 percent.
To learn more about nucleoside here
https://brainly.com/question/20373356
#SPJ2
If volatiles such as water vapor and carbon dioxide are added to a rock, what will happen to the melting temperature
Answer:
The melting temperature of a rock will decrease
Explanation:
In the case when the water vapour and the carbon dioxide is added to the rock so the rock melting temperature would be reduced as if we added the salt to an ice on a road so it reduced the temperature
Therefore according to the given situation, the last option is correct
And, the rest of the options are wrong
PLEASE PAANSWER NGA POOOO......
Answer:
................................................................. :3
Explanation:
What will happen when a piece of magnesium metal is dropped into a beaker containing a l M solution of copper(1) chloride?
Mg2+ + 2e = Mg(9) P = - 2.37 V
Cu2+ + 2e → Cu(9) ° = + 0.34 V
A. The magnesium will dissolve but nothing else will happen.
B. The magnesium will dissolve and the copper will be deposited
C. The copper will dissolve and the magnesium will be deposited
D. The magnesium will dissolve and chloride gas will be produced E. There will be no reaction,
Answer:
Did you get the answer to this?
Explanation:
I need this too.
NH3(aq) + HNO3(aq) → NH4NO3(aq) Calculate the volume of an acid (1.5 M HNO3) needed to neutralize the 1.5 M HNO3.
Answer:
NH3(aq) + HNO3(aq) → NH4NO3(aq) Calculate the volume of an acid (1.5 M HNO3) needed to neutralize the 1.5 M HNO3.
Explanation:
