How much mass of water at 100 ℃ must be heated so as to form steam at 100 ℃ when a burner supplies 45200 J of heat energy? Specific latent heat of vapourisation of water is 2260 J /g

10 g

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20 g

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30 g

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40 g

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Solution

The correct option is B
20 g

Given Q = 45200 J

L = 2260 J/g

Q = mL

M = Q/L

M=45200/2260

M = 20g

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How much mass of water at 100 ℃ must be heated so as to form steam at 100 ℃ when a burner supplies 45200 J of heat energy? Specific latent heat of vapourisation of water is 2260 J /g

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