4. A 50.0 mL sample of a 1.00 M solution of CuSO, is mixed with 50.0 mL of 2.00 M KOH in a calorimeter. The temperature of both solutions was 20.2 °C before mixing and 26.3 °C after mixing. The heat capacity of the calorimeter is 12.1 J/K. From these data, calculate AH for the process CuSO,(1 M) + 2KOH(2 M)- Cu(OH),(s)+ K,So,(0.5 M) it Assume that the specific heat and density of the solution after mixing are the same as those of pure water and that the volumes are additive.

A generic solid, X, has a molar mass of 82.3 g/mol. In a constant-pressure calorimeter, 46.1 g of X is dissolved in 337 g of water at 23.00 °C. X(s) X(aq) The temperature of the resulting solution rises to 29.50 °C. Assume the solution has the same specific heat as water, 4.184 J/(g.°C), and that there is negligible heat loss to the surroundings. How much heat was absorbed by the solution? q = kJ What is the enthalpy of the reaction? AHrxn kJ/mol =

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

When 60.0 mL of a 0.400 M solution of HNO3(aq) is combined with 60.0 mL of a 0.400 M solution of NaOH(aq) in a coffee-cup calorimeter, the final temperature of the solution is measured to be 26.6 °C. The initial temperature of the solutions is 24.0 °C. Calculate qrxn in joules, assuming the specific heat capacity of the final solution is 3.90 J.g-¹.°C-¹, the density of the final solution is 1.04 g/mL, and the calorimeter constant is 45 J/°C. (Hint: start with 9rxn+qsoln+qcal = 0.) The balanced chemical equation for this reaction is: HNO3(aq) + NaOH(aq) → H₂O(1) + NaNO3 (aq)

In a coffee cup calorimeter, a student places 0.350 g of magnesium, followed by addition of 45.0 mL of 1.00 M hydrochloric acid. After the reaction took place, a the temperature rose from 21.5oC to 54.2oC. If the reaction solution has the same properties of water and the calorimeter constant is 5.38 J oC-1, how much heat was released from the reaction and what is the enthalpy of the reaction in kJ mol-1? Answer choices for heat released from reaction: -7.89 kJ, -4.12 kJ, -6.50 kJ, -5.66 kJ

Aluminum metal can be produced by reducing solid aluminum oxide (Al2O3) with carbon (graphite). Carbon monoxide is the other product. What is the enthalpy change (AH° in kJ) when 25.0 g of aluminum metal is produced in this manner? You will need to balance the chemical equation. Enthalpies of formation (in kJ mol¯¹): Al2O3(s) -1675.7 CO(g) -110.5 Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a -623 b 623 с -734 d 734

A sample of NaOH (MM = 40.00 g/mol) with a mass of 1.811 g was added to a solution of HNO3 in a coffee cup calorimeter for a final volume of 100.0 mL. If both solutions were initially at 24.5 °C and the temperature of the resulting solution was recorded as 27.0 °C, determine the AH°rxn (in units of kJ/mol NaOH) for the neutralization reaction between aqueous NaOH. Assume that the density and the heat capacity of the resulting solution are the same as water, 1.00 g/mL and 4.184 J/(g x °C) respectively. Your Answer: Answer units

When 15.00 mL of 3.00 M NaOH was mixed in a calorimeter with 13.10 mL of 3.00 M HCI, both initially at room temperature (22.00 °C), the temperature increased to 29.60 °C. The resultant salt solution had a mass of 28.10 g and a specific heat capacity of 3.74 J K- g-. What is the heat capacity of the calorimeter (in J/°C)?Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ mol-1

A 25.0 mL portion of dilute HCl (aq) is combined with a 25.0 mL portion of dilute NaOH in a coffee-cup calorimeter. Both solutions are initially at a temperature of 23.3 ºC. The reaction produces enough heat to raise the final temperature of the 50.0 mL of liquid in the calorimeter to 25.3 ºC . What is qrxn in J? Assume the density of the reaction mixture is 1.0 g/mL and the specific heat of the solution is 4.184 J/g· ºC