10.40 A 50.75-g sample of water at 75.6°C is added to a sample of water at 24.1°C in a constant-pressure calorimeter. If the final temperature of the combined water is 39.4°C and the heat capacity of the calorimeter is 26.3 J/°C, calculate the mass of the water originally in the calorimeter. 10

11. A 114.06 mL sample of 0.245 M aqueous hydrochloric acid is added to 122.18 mL of 0.172 M aqueous ammonia in a calorimeter whose heat capacity (excluding any water) is 498.075 J/K. The following reaction occurs when the two solutions are mixed. HCl(aq) + NH3(aq) → NH4Cl(aq) The temperature increase is 2.03°C. Calculate ΔH rxn. Answer=____________________kJ/mol

A researcher studying the nutritional value of a new candy places a 3.90 g3.90 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.95 ∘C.2.95 ∘C. If the heat capacity of the calorimeter is 39.00 kJ⋅K−1,39.00 kJ⋅K−1, how many nutritional Calories are there per gram of the candy?

A researcher studying the nutritional value of a new candy places a 4.70 g4.70 g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.45 ∘C.2.45 ∘C. If the heat capacity of the calorimeter is 38.00 kJ⋅K−1,38.00 kJ⋅K−1, how many nutritional Calories are there per gram of the candy? Calories per gram of candy: