A student investigates the enthalpy of solution, ΔHsoln for ammonium chloride, NH4Cl. In addition to the salt, the student has access to a calorimeter, a balance with a precision of ±0.1 g, and a thermometer with a precision of ±0.1°C. To measure ΔHsoln for NH4Cl, the student adds 904.0 g of water, initially at 31.0 °C to a calorimeter and adds 155 g of NH4Cl (s), stirring to dissolve. After the NH4Cl dissolves completely, the temperature of the solution is 90.0 °C. Assume the calorimeter was perfectly insulated and the specific heat of the solution was 4.2 J/(g·K).   (a) Calculate the q for the dissolving of NH4Cl in water. Include units and proper sign in your answer. Show all work.   (b) Calculate the ΔHsoln for NH4Cl, in kJ/molrxn. Include units and proper sign in your answer. Show all work.   (c) Is the dissolving of NH4Cl endothermic or exothermic? Justify your answer.

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A student investigates the enthalpy of solution, ΔHsoln for ammonium chloride, NH4Cl. In

addition to the salt, the student has access to a calorimeter, a balance with a precision of

±0.1 g, and a thermometer with a precision of ±0.1°C.

To measure ΔHsoln for NH4Cl, the student adds 904.0

g of water, initially at 31.0 °C to a calorimeter and adds 155 g of NH4Cl (s), stirring to dissolve. After the NH4Cl dissolves completely, the temperature of the solution is 90.0 °C. Assume the calorimeter was perfectly insulated and the specific heat of the

solution was 4.2 J/(g·K).

 

(a) Calculate the q for the dissolving of NH4Cl in water. Include units and proper sign in

your answer. Show all work.

 

(b) Calculate the ΔHsoln for NH4Cl, in kJ/molrxn. Include units and proper sign in your

answer. Show all work.

 

(c) Is the dissolving of NH4Cl endothermic or exothermic? Justify your answer.

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