10. You need a water bath at 37.0 °C. The temperature of the cold tap water is 22.0 °C and the temperature of the hot tap water is 55.0 °C. What mass of hot water must be added to 90.0 g of cold water to reach 37.0 °C? The specific heat of H2O is 4.18 J/g•°C.

A 350.0 g iron pot is heated on a stove for a period of time until it is hot. The stove is turned off and 516 g of cold water (10.0 °C) is added to the pot. When thermal equilibrium is reached, the temperature of the water is  28.4 ° C. What was the initial temperature of the iron pot, assuming heat was exchanged between these two objects and none was lost to the surroundings? (The specific heat capacity of iron is 0.450 J/g °C. The specific heat capacity of water is 4.184 J/g °C) Give only the numerical answer in the box and not units. Give 4 sig figs in your answer. Show the calculations for the problem by writing it on a paper, upload the image file/pdf file in the question for file upload.

A 138.9 g sample of an unknown metal at a temperature of 99.1 °C is added to 44.72 g of water at a temperature of 19.1 °C. The specific heat of water is 4.184 Jg-1 °C- 1. The final temperature of the system is 52.2°C. Calculate the specific heat of the unknown metal.

A 5.71 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee cup calorimeter. Before placing the sample in the water, the temperature of the salt and water is 23.72 °C. After the salt has completely dissolved, the temperature of the solution is 28.54 °C. What quantity of heat, in J, was gained by the solution? Assume the specific heat of the solution is the same as water, 4.184 J/g * C.