A 25.0 mL sample of 0.5 M AgNO3(aq) is mixed with a 25.0 mL sample of 0.5 M NaCl(aq) in a calorimeter. The temperature of both solutions was 25.2oC before mixing and 29.9oC after mixing. The heat capacity of the calorimeter was 20.1 J/oC. From these data, calculate the ∆Hrxn in units of kJ/mol for the following reaction: AgNO3(aq) + NaCl(aq) ==> AgCl(s) + NaNO3(aq) Assume the specific heat and density of the solution after mixing are the same as those of pure water; specific heat capacity = 4.184 J/goC; density = 1.00 g/mL.

the molar heat capacity of iron is 25.10 J mol –1 K–1 . A 25.0 g ball is heated until it is glowing red (to a temperature of 400.°C). It is dropped into a 50.0 mL container of water at 25.0°C. If the density of water is 0.997 g mL–1 , and the molar heat capacity of water is 4.186 J g–1 K–1 , what temperature (in K) will the ball and water equilibrate to? A) 338 B) 300 C) 317 D) 359 E) 342

A piece of chromium metal with a mass of 24.50 g is heated in boiling water to 98.3 °C and then dropped into a coffee-cup calorimeter containing 82.3 g of water at 23.4 °C. When thermal equilibrium is reached, the final temperature is 25.7 °C. Calculate the specific heat capacity of chromium. (The specific heat capacity of liquid water is 4.184 J/g ⋅ K.)

Solid calcium chloride dissolves in water according to the equation below.CaCl2 (s) ➝ Ca+2 (aq) + 2 Cl – (aq)      ΔHº = –81.3 kJ/mol8.00 grams of solid CaCl2 dissolves in 45.0 grams of water initially at a temperature of 20.00 ºC in a perfect calorimeter. Calculate the final temperature of the solution in the calorimeter.[You may assume that no heat escapes the calorimeter and that all solutions have the same specific heat capacity as pure water (4.184 J/g·ºC)]Tfinal = Answer ºC

The molar heat of solution of a substance is found to be +21.38 kJ/mol. The addition of 0.100 mol of this substance to 1.000L of water initially at 40.0 degrees celsius results in a temperature decrease. Assume the specific heat of the resulting solution to be equal to that of pure water. Find the final temperature of the solution (Also assume that the heat capacity of the calorimeter is negligible).

5.00 × 10−2 mol KOH and an excess of hydrochloric acid are combined in 100.0 mL of water initially at 25.0 °C, leading to a final measured temperature of 31.1 °C. (a) What is the heat flow for the water in the calorimeter, qH2O, in Joules? (b) Assuming the calorimeter constant Ccal = 50.0 J °C , what is the heat flow for the calorimeter, qcal, in Joules? (c) What is the amount of heat given off by the reaction, qrxn, in Joules? (d) What is the molar enthalpy of the neutralization reaction (shown below) as measured in the calorimeter, ∆H◦ rxn in kilojoules per mole? H3O + (aq) + OH– (aq) → 2H2O (l)

An 8.0 g sample margarine was placed in a bomb calorimeter. It was then completely combusted leading to a temperature change of 36.18 °C. The heat capacity of the calorimeter was previously determined to be 7.25 kJ/kg°C. What was the quantity of heat released to the environment by the sample of margarine?

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 6.30 kg of water at 21.7 °C. During the reaction 143. kJ of heat flows out of the bath and into the flask. Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions iS 4.18 J·g¯¹·K¯¹. Round your answer to 3 significant digits.