There's 4 Questions 1. Which equation is a correctly written thermochemical equation?
A. Fe (s) + O2 (g)→Fe2O3 (s), ΔH= −3,926 kJ
B. C3H8 (g) + 5O2 (g)→3CO2 (g) + 4H2O (l), ΔH= −2,220 kJ/mol
C. NH4Cl→NH4 + + Cl−
D. 2C8H18 + 25O2→16CO2 + 18H2O, ΔH= −5,471 kJ/mol

2. How does a phase change affect a thermochemical equation?

A. It alters the products.
B. It affects the balance of the equation.
C. It can affect the ΔH value.
D. It alters the moles of reactants.

3. Consider the amount of heat energy delivered to an object by the same mass of liquid water at 100°C and steam at 100°C.

Which statement is true?

A. Liquid water and steam deliver the same amount of energy.
B. Steam delivers more energy because it is at a higher temperature.
C. Liquid water delivers more energy because it has more mass.
D. Steam delivers more energy because it condenses.

4. Methanol (CH3OH) has a heat of fusion of 3.16 kJ/mol.
What is the heat of solidification that occurs when 64 grams of liquid methanol freezes?

A. −199 kJ
B. −6.32 kJ
C. 6.32 kJ
D. 199 kJ