the study guide:

1: How much heat will be released (in kJ) is if 54.6 grams of liquid bromine (Br₂) is cooled from an initial temperature of 4.4C to a final temperature of -17.9 C?

the C_s solid = 0.2262 J/gC, the Melting point = -7.19C, the H_fusion = 10.52 kJ/mol, the C_s liquid = 0.4737 J/gC,

2. How much heat is required to convert (in kJ) 38.3 grams of butane (C₄H₁₀) form an initial temperature of -10.2 C to a final temperature of 18.7 C?

the C_s gas = 1.73 J/gC, the Boiling point = -0.40C, the H_vap = 22.44 kJ/mo, the C_s liquid = 2.278 J/gC