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  • 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 isOp

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

Option: 1

-315 kJ


Option: 2

+315 kJ


Option: 3

-630 kJ


Option: 4

-3.15 kJ


Answers (1)

best_answer

 

Enthalpy of combustion -

Amount of Enthalpy change when 1 mole of substance is completly burn in excess of Oxygen

- wherein

CO_{(g)}+\frac{1}{2}O_{2}(g)\rightarrow CO_{2(g)}+283\ KJ

\Delta H_{comb} \: of\: CO= 283\, KJ

 

 

Given, c(s)+o_2(g)\rightarrow co_2(g)

\Delta _fH= -393.5 \: \: kJmol^{-1}

Therefore, Heat released on formation of 44 g/mol of co_2= -395 \: \: kJ/mol

Therefore heat released on the formation of 35.2 g of co_2

=\frac{-393.5}{44}\times35.2 \: \: kJ\: \: =-315\: \: kJ

 

Posted by

Ajit Kumar Dubey

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