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  • The heat of fusion for a certain substance is <img alt="\mathrm{120 \mathrm{~J} / \mathrm{g} \text {. }}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7B120%20%5Cmathrm%7B%7EJ%7D%

The heat of fusion for a certain substance is \mathrm{120 \mathrm{~J} / \mathrm{g} \text {. }} How much heat is required to completely melt 50 grams
of this substance from solid to liquid at its melting point?

Option: 1

5000 J


Option: 2

6000 J


Option: 3

4500 J


Option: 4

7000 J


Answers (1)

best_answer

The heat (Q) required to change a substance from solid to liquid (melting) can be calculated using the formula:

\mathrm{Q=m \cdot \Delta H_f}

Where: Q = Heat (in joules) m = Mass of the substance (in grams)\mathrm{\Delta H_f=\text { Heat of fusion }(120 \mathrm{~J} / \mathrm{g})}

Step 1: Identify the given values: - m (mass) = 50 g - \mathrm{\Delta H_f=\text { Heat of fusion }(120 \mathrm{~J} / \mathrm{g})}

Step 2: Apply the formula to calculate the heat required for melting:

\mathrm{\begin{gathered} Q=50 \mathrm{~g} \cdot 120 \mathrm{~J} / \mathrm{g} \\ Q=6,000 \mathrm{~J} \end{gathered}}

So, the heat required to completely melt 50 grams of this substance from solid to liquid at its melting point is 6, 000 joules.
So, option B is correct

Posted by

vishal kumar

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