The vaporization of compound A is described by the given chemical equation.

A(l)⟶A(g)ΔHvap∘=42.69 kJ/mol

Calculate the entropy of vaporization, ΔSvap , for A(l) at 25.0 °C given that the boiling point of A is 78.99 °C , and the molar heat capacity of A(l) is 118.41 J/(mol⋅K) . Assume that the molar heat capacity of A(g) is 53.7% of that of A(l) .

ΔSvap=

J⋅mol−1⋅K−1

Calculate the standard Gibbs free energy of vaporization, ΔG∘vap , at 25.0 °C .

ΔG∘vap=

kJ/mol

Determine the equilibrium constant, K , for the vaporization at 181.0 °C.

K=

Determine the temperature at which the vaporization of A(l) becomes spontaneous. Assume that the enthalpy and entropy of vaporization change very little with temperature.

T=

°C

Is the vaporization of A(l) spontaneous at temperatures greater than or less than T?

less than T

greater than T

34.62 g of ferrous bromide reacts with 29.25 g of potassium chloride in a heated vessel. Write a balanced chemical equation for this double replacement reaction.  What is the percent yield of ferrous chloride if the actual yield is 10.25 g?  How much excess remains?  

Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of water. Cl2(aq) + S2O32- (aq) → Cl-(aq) + SO42-(aq)

use dimensional analysis to solve the following:

a) 789mmHg to atm

b)4.11 tons to Kg

c)6.87 quart to ml

2) A mixture is found to contain 3.17g of SiO2(sand), 6.01g of cellulose, and 7.32 g of calcium carbonate.what is the mass percentage of SiO2 in the mixture? please show a detail explanation.

d) 2.98x 10 to (the fifth power ) yard to Km

Based off these compounds, which one is the most hazardous and why?

Methyl Benzoate

Acetanilide

Nitric Acid (70%)

Acetic acid

Sulfuric Acid (98%)

The stopcock connecting a 1.00 L bulb containing helium gas at a pressure of 554 torr, and a 1.00 L bulb containing krypton gas at a pressure of 504 torr, is opened and the gases are allowed to mix. Assuming that the temperature remains constant, the final pressure in the system is ____torr

The binding energy per nucleon for magnesium-27 is 1.326*10^-12 J/nucleon. Calculate the atomic mass of magnesium-27, in amu. You may assume that the mass of a nucleon is 1.008 amu. (1 kg = 6.022*10²⁶ amu)

Consider an amphoteric hydroxide, M(OH)2(s), where M is a generic metal. M(0H)2 yields M+2OH M(OH)2 +2OH yields (M(OH4)2- Ksp=3x10^-16 Kf= .05 Estimate the solubility of M(OH)2 in a solution buffered at pH = 7.0, 10.0, and 14.0.

1. How could you distinguish between the following pairs using hydrogen NMR?
   1. cyclohexane and benzene
   2. butane and 2-methylpropane
   3. butyne and 1,3-dimethylbutane
   4. ethanol and dimethyl ether
   5. How could you distinguish between the pairs of compounds in question 1 using carbon NMR?

Draw structural formulas for all possible isomers having the following molecular formulas:

a. C₄H₁₀

b. C₂HBr₃

c. C₃H₆O

d. C₃H₄

Please explain also if you can. Thanks!

The reversible chemical reaction

A+B?C+D

has the following equilibrium constant:

Kc=[C][D][A][B]=3.4

Part A

Initially, only A and B are present, each at 2.00 M. What is the final concentration of A once equilibrium is reached?

Part B

What is the final concentration of D at equilibrium if the initial concentrations are[A] = 1.00M and [B] = 2.00M ?

What is the reaction A(g) + B(g) + C(g)------------> D(g) Experiment Initial [A] (mol/L) Initial [B] (mol/L) Initial [C] (mol/L) Initial rate (M/s) 1 0.0500 0.0500 0.0100 6.25*^(-3) 2 0.1000 0.0500 0.0100 1.25*^(-2) 3 0.1000 0.1000 0.0100 5*10^(-2) 4 0.0500 0.0500 0.0200 6.25*10^(-3)

1) What is the order with respect to each reactant?

2) Write the rate law

3) Calculate K (using the data from experiment 1)

Consider the titration of 50.0 mL of 0.0500 M C₂H₅NH₂ (a weak base; K_b = 0.000640) with 0.100 M HIO₄. Calculate the pH after the following volumes of titrant have been added: