When 25.0 grams of solid potassium hydroxide (KOH, molar mass = 56.1 g/mol) is dissolved in 100.0 grams of water, the solution increases in temperature by 61.5ºC. What is the molar heat of solution (ΔH) for potassium hydroxide in kJ/mol?

Remember that the mass of the solid is not added to the mass of the liquid to determine the mass of the solution. Just use the mass of the water.

q=CpmΔT and Cp for H2O = 4.18 J/gºC

Select one:

a. + 57.7 kJ/mol

b. - 1.03 kJ/g

c. - 57.7 kJ/mol

d. 57700 J/mol

Question

Chemistry

Layne Galloway

27 January, 19:28

When 25.0 grams of solid potassium hydroxide (KOH, molar mass = 56.1 g/mol) is dissolved in 100.0 grams of water, the solution increases in temperature by 61.5ºC. What is the molar heat of solution (ΔH) for potassium hydroxide in kJ/mol?

Remember that the mass of the solid is not added to the mass of the liquid to determine the mass of the solution. Just use the mass of the water.

q=CpmΔT and Cp for H2O = 4.18 J/gºC

Select one:

a. + 57.7 kJ/mol

b. - 1.03 kJ/g

c. - 57.7 kJ/mol

d. 57700 J/mol

+1

Answers (1)

Know the Answer?

Lea · Answer 1

They gave you the equation; Cp=,

just plug everything in! You've seen this; I have long ago, but we had different units. Sorry, but it's right there! Go get it!