To calculate the heat capacity of the water sample, we can use the formula:q = mcTwhere q is the heat capacity, m is the mass of the sample, c is the specific heat capacity of water, and T is the change in temperature.Given:m = 50 gc = 4.184 J/gCInitial temperature T1 = 25CFinal temperature T2 = 45CFirst, let's find the change in temperature T :T = T2 - T1 = 45C - 25C = 20CNow, we can calculate the heat capacity q :q = 50 g 4.184 J/gC 20C = 4184 JThe heat capacity of the 50g sample of water heated from 25C to 45C is 4184 J.