The heat of formation of CO2 is -95 text kcal . The amount of carbon which on burning will evolve 1000 kcal is

Question

The heat of formation of CO2 is -95 text kcal . The amount of carbon which on burning will evolve 1000 kcal is (A) 12.63 g (B) 17.95 g (C) 126.3 g (D) 179.5 g

Tardigrade Admin · Accepted Answer

C(s)+O2(g) xrightarrow[]CO2(g) Δ Hfo(CO2)=- text 95 text kcal text mol-1 =-95 kcal/12g of carbon Thus, carbon required for 1000 kcal of heat =(12× 1000/95) =126.3g

Q. The heat of formation of $C O_{2}$ is $- 95 k c a l$ . The amount of carbon which on burning will evolve 1000 kcal is

12.63 g

17.95 g

126.3 g

179.5 g

$C (s) + O_{2} (g) C O_{2} (g)$
$Δ H_{f}^{o} (C O_{2}) = - 95 k c a l m o l^{- 1}$
$= - 95$ kcal/12g of carbon
Thus, carbon required for 1000 kcal of heat
$= \frac{12 \times 1000}{95}$
$= 126.3 g$

Q. The heat of formation of CO2​ is −95kcal . The amount of carbon which on burning will evolve 1000 kcal is