Question

The enthalpy of formation of CO2 is -393.5k). The enthalpy change during
burning of 1.2g of Carbon is,
a.-39.3kJ b. +393kJ
c. -576kJ
d. +39.3kJ​

Answer 1

Answer:

The molar mass of CO

2

is 44 g/mol.

35.2 g of CO

2

corresponds to

44g/mol

35.2g

=0.8mol

When 1 mole of CO

2

is formed from C and oxygen, the heat released is -393.5 kJ. Negative sign indicates that heat is released.

When 0.8 moles of CO

2

are formed from C and oxygen, the heat released is −393.5×0.8=−315kJ

Explanation:

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Answer 2

The enthalpy of formation of CO2 is -393.5k). The enthalpy change during

burning of 1.2g of Carbon is,+576kJ