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Q.

Calculate ∆H in Joules for C(graphite) → C(Diamond) 
by using the following data
C(graphite) + O2(g) →  CO2(g) ; ∆H0 = –393.5kJ
C(Diamond) + O2(g) →  CO2(g) ; ∆H0 = –395.4kJ

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a

788 × 103

b

–788.9 × 103

c

1900

d

190000

answer is A.

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Detailed Solution

substract equation 2 from equation 1

C(graphite) → C(Diamond) ∆H= -393.5-(-395.4)=+1.9kJ = 1900J

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