Question

If the heat of combustion of C (graphite) is –400 kJ/mol, then the heat released upon the formation of 88 g of CO2 from C (graphite) is
A)800 kJ


B)300 kJ


C)600 kJ


D)1500 kJ

Answer 1

Answer:

1500 kJ

Explanation:

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Answer 2

Given :

1) Heat of combustion of C(graphite) = -400 kJ/mol

To find :

1) The heat released upon the formation of 88 g of CO2 from C (graphite)

Solution :

Molar mass of CO2 = 44 g/mol

Moles present in 88 g of CO2 = 88/44 mol = 2 mol

• When 1 mole of CO2 formed, heat released = -400 kj/mol

Therefore,

• When 2 mole of CO2 formed, heat released = - 2×400 kj/mol

= - 800 kj/mol

Answer :

Heat released upon formation of 88 g of CO2,

∆H = -800 kj/mol

| ∆H | = 800 kj/mol