Question

How much heat is required to raise the liquid water from $0^0$ C to ${30}^0$ C?

• A. 1.26 x ${10}^4$ J
• B. 3.8 x ${10}^5$ J
• C. 4.2 x ${10}^3$ J
  
• D. 6.6 x ${10}^5$ J
• E. 9.9 x ${10}^5$ J

Answer 1

The correct option is B 3.8 x ${10}^5$ J

Given : $m=3kg$ $S=4.2\times {10}^3$ $J/k{g}^{o}C$

Change in temperature $\Delta T=30-0={30}^{o}C$

Heat required to raise the temperature of water $Q=mS\Delta T=3\times 4.2\times {10}^3\times 30=3.8\times {10}^5$ J