Other Chemistry Answers

The following reaction is at equilibrium at 500 oC
CH4(g) + H2O(g)CO(g) + 3 H2(g)

Equilibrium concentrations were found to be:

[CH4(g)] = 2.46 x 10-3 M
[H2O(g)] = 4.97 x 10-3 M
[CO(g)] = 4.55 x 10-3 M
[H2(g)] = 2.20 x 10-3 M

Calculate the equilibrium constant for this reaction.

Write the equilibrium law expression for the following reaction in terms of its molar concentrations:
SOCl2(g) + H2O(g)SO2(g) + 2 HCl(g)

Using standard enthalpies of formation, determine the ΔHreaction for the following equations:

2 CH3OH(l) + 3 O2(g) → 2 CO2(g) + 4 H2O(g)

Standard Enthalpies of Formation

Compound ΔHf (kJ/mol)
CO(g) -110.5
CO2(g) -393.5
CH3OH(l) -238.4
H2O(g) -241.8

6.40 kJ of energy is needed to raise the temperature of a calorimeter and its contents 1.00 oC. When 2.00 g of propyne (C3H4(g)) is burned in a calorimeter, the temperature of the calorimeter was raised 15.0 oC. What is the molar heat of combustion of propyne?

(Please note that you must include units throughout all of your calculations and provide your answer in scientific notation to the correct number of significant digits.)

What mass of methane (CH4(g)) needs to be burned to heat 300 mL of water from 23.0 oC to the boiling point (98.0 oC)? (ΔHcombustion = -639 kJ /mol ; specific heat of water = 4.18 J/goC)

(Please note that you must include units throughout all of your calculations and provide your answer in scientific notation to the correct number of significant digits.)

in a reversible reaction equilibrium is obtained when the rate of the reverse reaction is equal to the rate of the reverse reaction to the rate of the forward reaction? is true or false?

A sample of gas at 25°C has a volume of 8 L and exerts a pressure of 690 mm Hg. How many moles of gas are in the sample?

Propane (C3H8) has a normal boiling point of -42.0°C and a heat of Vaporization (Hvapo) of 19.04Kj/mol. What is the Vapor Pressure of propane at 25.0°C?

Relative molecular mass of carbon dioxide

1. A. Fill in the blank space with the suitable answers.
Nitrogen, halogens and sulfur in organic compounds can be detected by performing the ................ test.
Presence of carbon and hydrogen in organic compounds can be detected by heating the organic compounds with .............

B. How will you evaluate the effectiveness of the methods you used to purify the compounds?

2. A. Differentiate between qualitative and quantitative analysis.

B. Identify the suitable methods to separate each of the following mixtures and explain how to separate them
i. Vegetable oil and sugar
ii. Salt and sugar
iii. Benzene and benzoic acid