Enthalpy of combustion of carbon to CO2 is -393.5 kJ mol-1. The heat released upon formation of 35.2 g of CO2 from carbon and dioxygen gas is (molar mass of CO2=44 g mol-1 )

Question

Enthalpy of combustion of carbon to CO2 is -393.5 kJ mol-1. The heat released upon formation of 35.2 g of CO2 from carbon and dioxygen gas is (molar mass of CO2=44 g mol-1 ) (A) 3.148 kJ (B) 31.48 kJ (C) 314.8 kJ (D) 3148 kJ

Tardigrade Admin · Accepted Answer

C(s)+O2(g) xrightarrow[] underset44 g mathopCO2(g); Δ H=-393.5 text kJ text mol-1 Heat released in the formation of 44 text g CO2=393.5 text kJ ∴ Heat released in the formation of 35.2 text g CO2=(393.5 kJ× 35.2 g/44 g) =314.8 text kJ

Q. Enthalpy of combustion of carbon to $C O_{2}$ is $- 393.5 k J m o l^{- 1} .$ The heat released upon formation of $35.2 g$ of $C O_{2}$ from carbon and dioxygen gas is (molar mass of $C O_{2} = 44 g m o l^{- 1}$ )

3.148 kJ

31.48 kJ

314.8 kJ

3148 kJ

$C (s) + O_{2} (g) 44 g C O_{2} (g);$
$Δ H = - 393.5 k J m o l^{- 1}$
Heat released in the formation of
$44 g C O_{2} = 393.5 k J$
$∴$ Heat released in the formation of
$35.2 g C O_{2} = \frac{393.5 k J \times 35.2 g}{44 g}$
$= 314.8 k J$

Q. Enthalpy of combustion of carbon to CO2​ is −393.5kJmol−1. The heat released upon formation of 35.2g of CO2​ from carbon and dioxygen gas is (molar mass of CO2​=44gmol−1 )