Question

When 64.0 g of methanol (CHOH) is burned, 1454 kJ of energy is produced. What is the heat of combustion for methanol?

Answer 1

 The heat  of combustion  for  methanol   is 727  kj/mol

    calculation

 calculate the moles  of methanol (CH3OH)

moles = mass/molar  mass

molar mass of methanol =  12 +( 1 x3)  +16 + 1= 32 g /mol

moles is therefore= 64.0 g / 32 g/mol =  2 moles

Heat of combustion  is therefore = 1454 Kj / 2 moles =  727  Kj/mol