# Chemistry

posted by Josh

Anyone know how to go about the problem? I don't know how to do it.

Assume a professor has a daily special request for her coffee. She likes to have the 250.0 mL of coffee frozen at -15.0°C overnight and then wants it heated to 95°C when she gets there in the morning.

ΔHfusion = 6.02 kJ/mol;
ΔHvaporization = 40.67 kJ/mol;
Csolid = 33.1 J/(molx°C);
Cliquid = 75.4 J/(molx°C);
Cgas = 33.1 J/(mol x °C)
Boiling point = 100°C; and
Melting point = 0°C.

Assume coffee and milk have all the physical properties of water.

a. How much heat energy is required to heat the coffee as per the special request?

b. Identify the name and process of each phase change in the coffee.

1. bobpursley

a. determine and find the following heats.
heat to bring coffee from -15C to 0
heat to melt coffee at 0C
heat to heat coffee to 95C

Milk? she didn't ask for any. Real chemistry profs drink black coffee.

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