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When you combine 50.0 mL of 0.100 M silver nitrate with 50.0 mL of 0.100 M...

When you combine 50.0 mL of 0.100 M silver nitrate with 50.0 mL of 0.100 M HCl, the temperature changes from 23.40˚C to 24.21˚C. Calculate ΔHrxn. (Assume a specific heat of 4.184 J / g · ˚C and use 1.00 g/mL as the density.)

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Answer #1

moles of AgNO3= 0.1*50/100= 0.05moles ,moles of HCl =0.1*50/100 =0.05 moles

AgNO3+ HCl----> AgCl+HNO3

1 mole of AgNO3 requires 1 mole of HCl to produce 1 mole of AgCl

0.05 moles of AgNO3 and 0.05 moles of HCl produces 0.05 moles of AgCl

volume of total solution =50+50 =100ml

mass of solution = volume*density =100*1=100 gms

heat release= mass*specific heat* temperature difference= 100*4.184*(24.21-23.4)=338.904 joules

heat of reaction= heat released/ mole of product= 338.904/0.05 joules/mole=6778.1 joules/mole =67.78 Kj/mol

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