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18-12-2022
Chemistry

Answered

A butane burner is used to heat water. The Mr of butane is 58.
● the enthalpy change of combustion of butane is –2877 kJ mol–1.
● 250 g of water is heated from 12 °C to 100 °C.
● The burner transfers 47% of the heat released from the burning fuel to the water.
Assume that the butane undergoes complete combustion and none of the water evaporates.

What is the minimum mass of butane that must be burnt?
A 0.068 g
B 1.85 g
C 3.94 g
D 4.48 g

Answer :

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