Question

The melting of 0.140 g of Br2 (which occurs at -7.2 C at 1 atm pressure) absorbs 9.43 J of heat. Compute the enthalpy change in 2.00 mol of Br2 when it freezes.

Answer 1

Convert 2.00 mol Br2 to grams.
moles = grams/molar mass.

9.43 J x (? g Br2/0.140 g Br2) = xx J.