When 1.00 mole of NH4NO3 dissolves in water, the enthalpy change is ?H = + 25.7

Question

When 1.00 mole of NH4NO3 dissolves in water, the enthalpy change is ?H = + 25.7 kJ. What is the enthalpy change if 17.5 grams of NH4NO3 are dissolved in water?

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How much heat is needed to raise the temperature of a 5.0 gram block of aluminum from 22.0C to 37.0C?

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When solutions of silver nitrate and calcium chloride are mixed, silver chloride precipitates out of solution according to the equation

2AgNO3(aq)+CaCl2(aq)?2AgCl(s)+Ca(NO3)2(aq)

What mass of silver chloride can be produced from 1.51L of a 0.201M solution of silver nitrate?

The reaction described in Part A required 3.51L of calcium chloride. What is the concentration of this calcium chloride solution?

Explanation / Answer

No. of moles of NH4NO3 = mass taken/ molar mass = 17.5g/80.04g/mol = 0.218 moles

So, as 1 mole gave enthalpy change of + 25.7 kJ, 0.218 moles gave enthalpy change of 25.7 x 0.218 = 5.619kJ

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