If 100 J of heat is needed to completely change the substance from a solid to a liquid state, what is the heat of fusion for the substance?

1,000 J/kg

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100 J/kg

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50 J/kg

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20 J/kg

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5 J/kg

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Solution

The correct option is C 50 J/kg
$Q = m L_{f}$

$⟹$ $L_{f} = \frac{Q}{m} = \frac{100 J}{2 k g} = 50 \frac{J}{k g}$

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If 100 J of heat is needed to completely change the substance from a solid to a liquid state, what is the heat of fusion for the substance?

The correct option is C 50 J/kgQ=mLf ⟹ Lf=Qm=100J2kg=50Jkg

The correct option is C 50 J/kg
$Q = m L_{f}$

$⟹$ $L_{f} = \frac{Q}{m} = \frac{100 J}{2 k g} = 50 \frac{J}{k g}$