Question 1
If 10.6 moles of water at 35°C absorbs 12.30 kJ, what is the final temperature of the water? The specific heat of water is 4.184 J/g·°C.
◦ 15°C
◦ 20°C
◦ 35°C
◦ 50.°C
◦ 312°C
Question 2
Methanol (CH
3OH) burns according to the equation
2CH
3OH(l) + 3O
2(g) → 2CO
2(g) + 4H
2O(l), ΔH°
rxn = –1454 kJ/mol.
How much heat, in kilojoules, is given off when 75.0 g of methanol is burned?
◦ 727 kJ
◦ 3.22 × 10
3 kJ
◦ 1.45 × 10
3 kJ
◦ 1.70 × 10
3 kJ
◦ 3.41 × 10
3 kJ