The heat of combustion of carbon to CO2 is - 393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is:

Question

The heat of combustion of carbon to CO2 is - 393.5 kJ/mol. The heat released upon formation of 35.2 g of CO2 from carbon and oxygen gas is: (A) - 630 kJ (B) - 3.15 kJ (C) - 315 kJ (D) +315 kJ

Tardigrade Admin · Accepted Answer

Formation of CO2 from carbon and dioxygen gas can be represented as C(s) + O2(g) arrow CO2(g) ; ΔfH = - 393.5 kJ mol-1 (1 mole = 44 g) Heat released on formation of 44 g CO2 = -393.5 kJ mol-1 = (-393.5 kJ mol-1/44g) × 35.2 g = - 315 kJ

Q. The heat of combustion of carbon to CO2​ is −393.5kJ/mol. The heat released upon formation of 35.2 g of CO2​ from carbon and oxygen gas is:

- 630 kJ

- 3.15 kJ

- 315 kJ

+315 kJ

Formation of CO2​ from carbon and dioxygen gas can be represented as C(s)+O2(g)​→CO2(g)​;Δf​H=−393.5kJmol−1 (1 mole = 44 g) Heat released on formation of 44 g CO2​ =−393.5kJmol−1 =44g−393.5kJmol−1​×35.2g =−315kJ

Q. The heat of combustion of carbon to $C O_{2}$ is $- 393.5 k J / m o l$ . The heat released upon formation of 35.2 g of $C O_{2}$ from carbon and oxygen gas is: