Potassium nitrate, KNO3 , has a molar mass of 101.1 g/mol. In a constant-pressure calorimeter, 41.3 g of KNO3 is dissolved in 225 g of water at 23.00 °C . KNO3(s)−→−−H2OK+(aq)+NO−3(aq) KNO 3 ( s ) → H 2 O K + ( aq ) + NO 3 − ( aq ) The temperature of the resulting solution decreases to 18.20 °C 18.20 ° C . Assume that the resulting solution has the same specific heat as water, 4.184 J/(g·°C) 4.184 J / ( g · ° C ) , and that there is negligible heat loss to the surroundings. How much heat was released by the solution?
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Potassium nitrate is a chemical compound with the chemical formula KNO
3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−, and is therefore an alkali metal nitrate. It occurs in nature as a mineral, niter (or nitre in the UK).[6] It is a source of nitrogen, and nitrogen was named after niter. Potassium nitrate is one of several nitrogen-containing compounds collectively referred to as saltpetre (or saltpeter in North America).[6]
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