Question

A kettle contains 2kg of water at 20 degree celsius. What mass of methane must be burned to raise this quantity of water to 100 degree celsius?

Answers

Look up (or calculate) the heat of combustion for methane. I'll call that Z.
Then Z = mass H2O x specific heat H2O x (Tfinal-Tinitial)
Keep mass and specific heat units consistent.

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