You want to determine the molar heat of solution of sodium chloride using a 10.0 g sample of NaCl(aq) and 50.0 mL of water in a coffee cup calorimeter. Which of the following equations would you use? Assume the specific heat of the solution is the same as the specific heat of water.

Question

A. q = (50.0 g)(4.18 J/g K)(Ti - Tf)

B. q = [(10.0 g)(4.18 J/g K)(Tf - Ti)]/[10.0 g/(58.44 g/mol)]

C. q = (60.0 g)(4.18 J/g K)(Tf - Ti)

D. q = (60.0 g)(4.18 J/g K)(Ti - Tf)

E. q = [(60.0 g)(4.18 J/g K)(Tf - Ti)]/[10.0 g/(58.44 g/mol)]

Answer 1

I wouldn't use any of them.

Answer 2

But one of these has to be the answer.

Answer 3

I guess the intent is to heat ALL of the solution with the same specific heat of water so I would go with E.

Answer 4

Ok. Thanks once again!