Question

How much heat is needed to melt the block of ice?

• A. 1.26 x ${10}^4$J
• B. 4.2 x ${10}^5$J
• C. 3.3 x ${10}^5$J
• D. 6.6 x ${10}^5$ J
• E. 9.9 x ${10}^5$ J

Answer 1

The correct option is E 9.9 x ${10}^5$ J

Given : $m=3$ kg ; $L_f=3.3\times {10}^5$ J/kg

Heat required to melt the ice $Q=m{L}_f=3\times 3.3\times {10}^5=9.9\times {10}^5$ J