The molar mass of an unknown salt is 63.5. If 4.81 g is added to 81.1 mL of water the temperature changes from 20.95oC to 21.62oC. What is the molar heat of solution (J/mol) of the salt? (Assume all of the heat is transfered to the water) Express your answer to the nearest whole number (XXXX.).

Question

The molar mass of an unknown salt is 63.5. If 4.81 g is added to 81.1 mL of water the temperature changes from 20.95oC to 21.62oC. What is the molar heat of solution (J/mol) of the salt? (Assume all of the heat is transfered to the water) Express your answer to the nearest whole number (XXXX.).

DrBob222 · Answer

mass H2O x specific heat H2O x (Tfinal-Tinitial) = q dHsoln/g is q/4.81 dHsoln/mol is (q/4.81)* 63.4g/mol

John · Answer

Thanks for all the help Bob!