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ziro4ka [17]
3 years ago
7

A kettle heats 1.75 kg of water. The specific latent heat of vaporisation of water is 3.34 x 106 J/kg. How much energy would be

needed to boil off the water? Write the answer out in full (i.e. not in standard form).
Physics
1 answer:
labwork [276]3 years ago
7 0

The amount of energy needed to boil off the water is 5,845,000 J

Explanation:

The amount of thermal energy needed to completely boil a certain amount of a liquid substance already at boiling temperature is given by

Q=m\lambda_v

where

m is the amount of the substance

\lambda_v is the specific latent heat of vaporization of the substance

In this problem, the substance is water, and its mass is

m = 1.75 kg

Its specific latent heat of vaporization is

\lambda_v = 3.34\cdot 10^6 J/kg

Assuming that the water is already at boiling temperature, therefore, the thermal energy needed to boil off the water is

Q=(1.75)(3.34\cdot 10^6)=5,845,000 J

Learn more about specific heat:

brainly.com/question/3032746

brainly.com/question/4759369

#LearnwithBrainly

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