First, we need to find out how many moles of water we have. n=
m
M
=
180
18
=10mol ∆T=T2−T1=15−10=5K The energy needed to heat the water is given by the formula: Q=nCp∆T Here, n is number of moles (10), Cp is the specific heat (75.3Jmol−1K−1), and ∆T is the temperature change (5 K). So, Q=10×75.3×5=3765J
