MediumChemistryHigh School (11–12)HydrocarbonsNumerical

A cooking-gas cylinder holds 1.00 kg of propane…

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A cooking-gas cylinder holds $1.00\ \text{kg}$ of propane. The heat of combustion is $2220\ \text{kJ}$ for each mole of propane, and the molar mass is $44.10\ \text{g/mol}$ . The carbon dioxide has a molar mass of $44.01\ \text{g/mol}$ .

Find the moles of propane, the heat given out in megajoules, and the mass of carbon dioxide formed if all the propane burns completely.

Need a reminder? The key ideaShow

Halogenation of an alkane is a free-radical chain. The share of a product is the number of hydrogen atoms of that kind times their relative rate, divided by the total. Chlorine: $1 : 3.8 : 5.0$ for primary, secondary and tertiary. Bromine: $1 : 82 : 1600$ . Complete combustion of an alkane gives $\text{CO}_{2}$ and $\text{H}_{2}\text{O}$ .

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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