A calorimeter contains 31 .0 mL of water at 14.5 C . When I .90g of X (a substan
ID: 866924 • Letter: A
Question
A calorimeter contains 31 .0 mL of water at 14.5 C . When I .90g of X (a substance with a molar mass of 70.0g/mol ) is added, it dissolves via the reaction and the temperature of the solution increases to 27.0 Degree C . Calculate the enthalpy change, Delta H for this reactio4 per mole of X. Assume that the specific heat of the resulting solution is equal to that of water [4.18 J/(g. C)j, that density of water is 1.00 g/mL. and that no heat is lost to the calorimeter itself, nor to the surroundings.Explanation / Answer
heat evoled = 4.184J/gC * (31+1.9)g * (27-14.5)C = ??
dH solution = - (heat evolved) / (1.9 g X / MW X g/mole) = ?? J/mole
Plug and SOLVE
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