Question

how much heat needs to be added to 5.2 grams of copper to change its phase from solid to liquid.? ( specific latent heat of fusion of copper=205×10³ J/kg.)
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Answer 1

We have to find the heat needs to be added to 5.2 g of copper to change its phase from solid to liquid.

Specific Latent heat of fusion of copper , Lf = 205 × 10³ J/kg

Solution : heat needs to be change the phase of any substance from solid to liquid is given by, H = mLf

Where m is mass of substance and Lf is specific latent heat of fusion.

so, heat = 5.2 g × 205 × 10³ J/kg

= 5.2 × 10¯³ kg × 205 × 10³ J/Kg

= 5.2 × 205 J

= 1066 J

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