A-level Physics · Specific latent heat

Specific latent heat

Use Q = mL for an energy, the mass changed by a heater, or the latent heat from an experiment.

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Question 1

A 250 W heater supplies energy to water for 20 minutes and all the energy is used to boil away the substance. The specific latent heat of vaporisation of water is 2.26×1062.26 \times 10^{6} J kg⁻¹. Calculate the mass of water that boils away, in g. Give your answer to 3 significant figures.

g

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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