KVPY SA Exam 2014 Question Paper

Question : 33 of 80

Marks: +1, -0

The volume of oxygen at STP required to bum 2.4 g of carbon completely is

Solution:

C + O_2\ ––––▸ CO_2

2.4 /12= 0.2

mole of carbon
∴ 0.2 mole of C need 0.2 mole of O

_2

So vol. of 0.2 mole O

_2

at STP = 0.2 × 22.4 = 4.48 L

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