Question

1 moles of propane (C3H8)on combusting at STP gives "A"kilo joules of heat energy caliculated the heat liberated when 2.4 itrs of propane on combustion at STP

Answer 1

the heat liberation will be the same as in combusting 1 mole I.e. A joules.
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Answer 2

One mole of any gas occupies 22.4 L volume at STP conditions.

So, for 2.4 L of gas,

Number of moles = n = 2.4/22.4
So, n=0.107 moles


Now, 1 mole propane gives "A" kJ
So, 0.107 mole propane will give
(0.107×A) kJ of energy