The freezing point of t-butanol is 25.50°C and is 9.1°C kg/mol. Usually t-butanol absorbs water on exposure to air. If the freezing point of a sample which contains 12.4 g of t-butanol is 24.56°C, how many grams of water are present in the sample?

Athe top of a hill, an athlete on a skateboard has x joules of mechanical energy. how much mechanical energy will she have at the bottom of the hill? ignore the effects of friction.

Calculate the number of grams of sodium in 3.00 g of each sodium-containing food additive.

The equilibrium constant kc for the reaction 2 nocl(g) → 2 no(g) + cl2(g) is 0.453 at a certain temperature. a mixture of nocl, no, and cl2 with concentrations 1.30, 1.20, and 0.600 m, respectively, was introduced into a container at this temperature. which of the following is true? 1. no apparent reaction takes place. 2. [cl2] = 0.30 m at equilibrium. 3. nocl(g) is produced until equilibrium is reached. 4. [nocl] = [no] = [cl2] at equilibrium. 5. cl2(g) is produced until equilibrium is