Question #6385

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) 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]

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