Inorganic Chemistry Answers

(b) Molar volume of an ideal gas at S.A.T.P. (25oC and 1.00 bar is 24.8 dm3 mol-1.
Assume that gases are at 225oC and P=1.00 atmosphere before and after the combustion and behave as ideal gases.

The chemical equation for the combustion of butane is:
2C4H10(g) + 13O2(g) → 8CO2(g) + 10H2O(l)

At 225oC, we ignite a mixture of 5.00 dm3 of butane and 75.0 dm3 of O2

i. Is there enough oxygen for the complete combustion of the butane present? Explain your answer. [2 marks]
ii. What gases are present in the resulting mixture after combustion? [2 marks]
iii. Calculate the final volume of the mixture after combustion (3 sig. fig). [4 marks]
iv. Calculate the amounts (number of moles) of O2 and butane consumed using the
molar volume of an ideal gas at S.A.T.P (3 sig. fig). [4 marks]
v. The final mixture is cooled down from 225oC to 25oC. Calculate the volume of
the resulting gaseous mixture (3 sig. fig.). [3 marks]

Question 3.
(a) i. Write a balanced chemical equation with state symbols for the combustion of ethane. [1 mark]
ii. ΔHoc[C2H6] = -1560kJ.mol-1, write the corresponding thermochemical equation. [1 mark]
iii. Calculate the heat generated by the complete combustion of 15.0g of ethane. [2 marks]


(b) Molar volume of an ideal gas at S.A.T.P. (25oC and 1.00 bar is 24.8 dm3 mol-1.
Assume that gases are at 225oC and P=1.00 atmosphere before and after the combustion and behave as ideal gases.

The chemical equation for the combustion of butane is:
2C4H10(g) + 13O2(g) → 8CO2(g) + 10H2O(l)

At 225oC, we ignite a mixture of 5.00 dm3 of butane and 75.0 dm3 of O2

i. Is there enough oxygen for the complete combustion of the butane present? Explain your answer. [2 marks]
ii. What gases are present in the resulting mixture after combustion? [2 marks]
iii. Calculate the final volume of the mixture after combustion (3 sig. fig). [4 marks]
iv. Calculate the amounts (number of moles) of O2 and butane consumed using the
molar volume of an ideal gas at S.A.T.P (3 sig. fig). [4 marks]
v. The final mixture is cooled down from 225oC to 25oC. Calculate the volume of
the resulting gaseous mixture (3 sig. fig.). [3 marks]

A freshman studying medicine at an Ivy League College is a part of his class crew team and exercises regularly. After a particularly strenuous exercise session, he experiences severe cramps in his thighs and pain in his biceps.
• Explain the chemical process that occurred in his muscle cells to cause this discomfort.

• Explain the chemical reactions that have possibly taken place in his body after the exercise.

• Discuss possible treatments for the freshman and how the treatment works chemically.

1) Consider the following reversible heterogneous reaction:
C(s) + Carbon Dioxide(g) ----> 2CO(g)

At 700 degress Celcius, the total pressure of the system is found to be 3.45 atm. If the equibruim constant Kp for this reaction is equal to 1.52, calculate the equilibrium partial pressures of Carbon Dioxide and CO gases

Revising for chemistry exam, but don't understand enthalpy of neutralisation. Once I have found Q (using Q=mct) do I divide this value by moles of water or moles of acids/base. If its acid/base moles i use how do i determine which to use since I could have an acid which neutralises a base on a 2:1 ratio.