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Question

2 g of butane is burnt with an excess of oxygen to form CO2. What is the approximate amount of CO2 formed?

A
2 g
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B
3 g
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C
1.5 g
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D
6 g
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Solution

The correct option is D 6 g
The balanced equation is :
C4H10+132O24CO2+5H2O
Number of moles of butane=Given massMolar mass=2 g58 g/mol=0.0345 mol
1 mol of butane produces 4 mol of CO2.
0.0345 mol of butane will produce (4×00345)=0.138 mol CO2
Amount of CO2 produced =No. of moles×molar mass
=0.138 mol×44 g/mol
=6.07 g

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