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Question

How many grams of methane are required to produce 22 g CO2 by combustion?
CH4+2O2CO2+2H2O

A
8 g
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B
3 g
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C
4 g
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D
5 g
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Solution

The correct option is A 8 g
CH4+2O2CO2+2H2O

Moles of CO2=2244=0.5 mol
1 mol of CO2 is produced from 1 mol of CH4.
So, 0.5 mol of CO2 will be produced from 0.5 mol of CH4.
Mass of CH4 formed = Moles × Molar mass
Mass of CH4 formed =0.5 mol×16 g/mol=8 g

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