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Question 7

The formula CH3CH2CH2CH3\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3CH3​CH2​CH2​CH3​ represents one of the hydrocarbon compounds found in canisters of camping gas.

a.

For this compound: (i) Give its molecular formula. (ii) Give its empirical formula. (iii) Give the name of this compound. (iv) Give the general formula of the homologous series that contains this compound.

[4]
b.

Balance the equation to show the complete combustion of this compound:

‾C4H10+‾O2→‾CO2+‾H2O \underline{\quad}\text{C}_4\text{H}_{10} + \underline{\quad}\text{O}_2 \rightarrow \underline{\quad}\text{CO}_2 + \underline{\quad}\text{H}_2\text{O} ​C4​H10​+​O2​→​CO2​+​H2​O
[1]
c.

A 2.5 mol2.5\text{ mol}2.5 mol sample of butane was completely combusted. (i) Deduce the amount, in moles, of oxygen (O2\text{O}_2O2​) needed. (ii) Calculate the volume, in dm3\text{dm}^3dm3, that this amount of oxygen would occupy at room temperature and pressure (rtp). Assume the molar volume of gas is 24 dm3/mol24\text{ dm}^3/\text{mol}24 dm3/mol at rtp.

[2]

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