We have $2.0 k g$ of a block of a substance at its melting point. The substance has a latent heat of fusion of $1500 J$ per kilogram and a specific heat of $2500 J$ per kilogram degree Celsius.
How much heat is needed to change the block entirely into a liquid?

5000 J

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750 J

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1250 J

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3000 J

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8000 J

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Solution

The correct option is D $3000 J$
Given : $m = 2.0$ kg $L_{f} = 1500$ J
$∴$ Heat needed to convert the entire solid block into liquid $Q = m L_{f} = 2.0 \times 1500 = 3000$ $J$

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We have 2.0 kg of a block of a substance at its melting point. The substance has a latent heat of fusion of 1500 J per kilogram and a specific heat of 2500 J per kilogram degree Celsius.How much heat is needed to change the block entirely into a liquid?

The correct option is D 3000 JGiven : m=2.0 kg Lf=1500 J∴ Heat needed to convert the entire solid block into liquid Q=mLf=2.0×1500=3000 J

We have $2.0 k g$ of a block of a substance at its melting point. The substance has a latent heat of fusion of $1500 J$ per kilogram and a specific heat of $2500 J$ per kilogram degree Celsius.
How much heat is needed to change the block entirely into a liquid?

The correct option is D $3000 J$
Given : $m = 2.0$ kg $L_{f} = 1500$ J
$∴$ Heat needed to convert the entire solid block into liquid $Q = m L_{f} = 2.0 \times 1500 = 3000$ $J$