A cooking-gas cylinder holds 1.00 kg of propane…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A cooking-gas cylinder holds of propane. The heat of combustion is for each mole of propane, and the molar mass is . The carbon dioxide has a molar mass of .
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: for primary, secondary and tertiary. Bromine: . Complete combustion of an alkane gives and .
The worked solution
Have you tried it?
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.
Step 1. The equation. .
Step 2. Moles. .
Step 3. Heat. .
Step 4. Carbon dioxide. . The mass is .
Answer: , and of carbon dioxide.
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