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Two reactions are given below : C("(gr...

Two reactions are given below :
`C_("(graphite)")+O_(2(g))rarrCO_(2(g)),DeltaH=-393.7kJ`
`C_("(diamond)")rarrC_("(graphite)"),DeltaH=-2.1kJ`
What quantity of diamond will give 800 kJ of heat on burning ?

A

24.25 g

B

15.24 g

C

2 g

D

12.12 g

Text Solution

Verified by Experts

The correct Answer is:
A
`C_("(diamond)")+O_(2(g))rarrCO_(2(g))`
`=-393.7+(-2.1)=-"395.8 kJ"`
`"800 kJ will b given by "(12)/(395.8)xx800=24.25g`
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