A 91.70 g sample of metal was heated in a boiling water bath at 99.4 Â°C....

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Chemistry

A 91.70 g sample of metal was heated in a boiling water bath at99.4 Â°C. The hot metal was then placed in a calorimeter, with heatcapacity 39 J/K containing 45.0 g of water. Analysis of thethermogram showed the initial temperature to be 21.1Â°C, the finaltemperature to be 42.3Â°C.
4.91 g of LiCl was dissolved in 50.0 mL of water in the samecalorimeter as in problem (above)
1. Analysis of the thermogram showed the initial temperature tobe 22.9ï‚°C, the final temperature to be 49.2ï‚°C.
Was the dissolution of the ionic solid exothermic orendothermic?
Calculate the mass of the water
Calculate delta H solution
Calculate delta H ( - above H with degrees) solution (assumeconstant pressure of 1 bar)
Please post work because I want to learn this material.. notjust get answers. Thanks

Answer & Explanation Solved by verified expert

3.9 Ratings (723 Votes)

Dissolution is exothermic or endothermic The temperature rises from 229 C to 492 C which clearly indicates that dissolution of the ionic solid is exothermic since heat is released which increases the temperature Mass of water The normal See Answer

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