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  • Enthalpy of combustion of carbon to CO 2 is minus 393.5 kJ mol raised to minus 1. Calculate the heat released upon formation of 35.2 g of CO2 from carbon and dioxygen gas.

6.11 Enthalpy of combustion of carbon to CO_2  is -393.5 KJ mol ^{-1}  Calculate the heat  released upon formation of 35.2 g of CO_2 from carbon and dioxygen gas.

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Formation of carbon dioxide from carbon and dioxygen reaction is-

C+O_{2}\rightarrow CO_{2}    .............  \Delta H_f = -393.5 kJ/mol

1 mole of CO_2  = 44 g
So, the heat released in the formation of  44g of CO_2 = -393.5 kJ/mol
therefore, In 35.5 g of CO_2  the amount of heat released =                                                                                        
                                                                                                \frac{-393.5}{44}\times 35.2 = -314.8 kJ/mol   
 

 

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manish

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