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Q.

Enthalpy of combustion of cyclopropane is -4000KJ/mole. The amount of cyclopropane needed to burn for producing $2 X 10^{5} K J$ of heat is

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a

20 kg

b

2.1kg

c

21 gr

d

210 mg

answer is B.

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Detailed Solution

$C_{3} H_{8}$
42 gr _____4000 KJ
? ______ 2x10⁵ KJ
=2.1 kg

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