Molar Bookkeeping and Thermodynamics Units Review

Front

What is vapor pressure?

Back

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid or solid phase at a given temperature. It indicates the tendency of a substance to evaporate.

Front

What is the vapor pressure of water at 80°C?

Back

47 kPa.

Front

What is the heat of fusion?

Back

The heat of fusion is the amount of energy required to change a substance from solid to liquid at its melting point.

Front

How much heat is absorbed by neon when it transitions from a solid to a liquid?

Back

0.33 KJ.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases heat to its surroundings.

Front

If 0.75 mol of Mg burns in an excess of O2 and -4.5 x10^2 KJ of heat is released, is this reaction endothermic or exothermic?

Back

Exothermic.

Front

What is specific heat?

Back

Specific heat is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius.

Front

What is the formula to calculate heat absorbed or released?

Back

q = m * c * ΔT, where q is heat, m is mass, c is specific heat, and ΔT is the change in temperature.

Front

What is the total heat absorbed by methanol (CH4O) in regions 3 and 4?

Back

48.3 KJ.