To calculate the heat capacity of 20 grams of water heated from 25C to 50C, we can use the formula:Q = mcTwhere Q is the heat capacity, m is the mass of the water, c is the specific heat capacity of water, and T is the change in temperature.The specific heat capacity of water is 4.18 J/ gC .Given:m = 20 gramsT = 50C - 25C = 25Cc = 4.18 J/ gC Now, we can plug these values into the formula:Q = 20 g 4.18 J/ gC 25C Q = 20 4.18 25Q = 2090 JSo, the heat capacity of 20 grams of water heated from 25C to 50C is 2090 Joules.