Question

6.What will be the final temperature of a 554−g sample of water, initially at 14.0°C, after 54.3 kJ have been added to it?

______________C

Be sure to answer all parts

7.A 0.3275−g sample of solid magnesium is burned in a constant-volume bomb calorimeter that has a heat capacity of 3024 J/°C. The temperature increases by 2.682°C.

(a) Calculate the heat given off by the burning Mg in kJ/g.

_________ kJ/g

(b) Calculate the heat given off by the burning Mg in kJ/mol.

_________kJ/mol

8.given the following thermochemical equations,

NO(g) + O3(g) → NO2(g) + O2(g)                ΔH = −198.9 kJ/mol

O3(g) → 3/2 O2(g)                                           ΔH = −142.3 kJ/mol

O2(g) → 2O(g)                                                   ΔH = +495 kJ/mol

determine the enthalpy change for the reaction

2NO2(g) → 2NO(g) + O2(g)

ΔH = _________ kJ/mol

Answer 1