When 1.00 g of AgCl is formed by the reaction in a coffee cup calorimeter, the temperature of 20.0 g of water increases from 15.0 degrees celsius to 20.47 degrees celsius. Calculate  a) the amount of heat absorbed by the water b) delta H when one mole of AgCl is formed by this reaction

Chemistry by OpenStax (2015-05-04)
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Chapter5: Thermochemistry
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Problem 27E: The addition of 3.15 g of Ba(OH)28H2O to a solution of 1.52 g of NH4SCN in loo g of water in a...
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When 1.00 g of AgCl is formed by the reaction in a coffee cup calorimeter, the temperature of 20.0 g of water increases from 15.0 degrees celsius to 20.47 degrees celsius. Calculate 

a) the amount of heat absorbed by the water

b) delta H when one mole of AgCl is formed by this reaction

Expert Solution
Introduction

Heat absorbed by water can be calculated by using the formula:Q = m.Cp.T

where, Q = heat absorbed/ releasedm = mass of substanceCp = specific heat capacityT = Change in temperature

Part a

Given: Mass of water, m= 20.0 gSpecific heat capacity of water, Cp = 4.184 J g-1 °C-1Change in temperature, T = 20.47°C-15.0°C = 5.47°CQ = m.Cp.TQ = 20.0 g×4.184 J g-1 °C-1×5.47°CQ = 457.73 J 457.73 J  of heat is absorbed by the water.

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