Answer:
1600 cal
Explanation:
The formula
q=mΔ[tex]_{fus}[/tex][tex]H^{0}[/tex]
is used to calculate the heat required to melt a solid where q=amount of heat, m=mass and Δ[tex]_{fus}[/tex][tex]H^{0}[/tex] is the enthalphy of fusion
now we substitute, m=20g, Δ[tex]_{fus}[/tex][tex]H^{0}[/tex]=80cal/g
Therefore, q=20g x 80cal/g =1600 cal
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