Answer to Question #133939 in Molecular Physics | Thermodynamics for kgokane sekgoka

Question

Determine how much heat is required to bring 750 ml of water from standard room temperature to the boiling point when Standard room temperature is 21° C and the boiling point of water is 99° C.

Answer 1

Volume of water, $V = 750 ml = 750*0.001*10^{-3} = 7.5*10^{-4} m^3$

Density of water, $\rho = 1000 kg/m^3$

Mass of water, $m = \rho V = 1000 * 7.5*10^{-4} = 0.75 kg$

Heat required, $H = ms(\Delta T) = 0.75 * 4200*78 = 245700 J = 245.7 KJ$

where s is specific heat of water.