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aliduck aliduck
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6 years ago
Calculate the molar enthalpy of combustion for methanal, CH2O(l), if 47.5
kJ of energy is transferred when 2.50 g of methanal is burned in a
calorimeter.  (3 Marks)
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#1
Staff Member
6 years ago
Molar mass of methanol, CH3OH = 12+3+16+1 = 32g/mol
Moles in 2.50g of methanol, CH3OH = 2.5g/32g/mol = 0.078125mol
The molar enthalpy of combustion for methanol = 47.5kJ/0.078125mol = 608kJ/mol

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#2
2 years ago
It is methanal not methanol. the answer is -570.57 kJ because it is being transferred to the water.
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