NCERT Class XI Chemistry Thermodynamics Solutions

Question : 11

Total: 22

Enthalpy of combustion of carbon to CO2 is –393.5 kJmol–1. Calculate the heat released upon formation of 35.2 g of CO2 from carbon and dioxygen gas.

Solution:

C + O2 → CO2 ; ΔH = –393.5 kJ
Since When 44 g of CO2 is formed from carbon and dioxygen gas, heat released = 393.5 kJ
∴ When 35.2 g of CO2 is formed from carbon and dioxygen gas, heat released
=

393.5×35.2

13851.2

= 314.8 kJ
Thus, ΔH = - 314.8 kJ

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