How many moles do we need to add to 850. mL of water to get a 1.60 M solution?

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

0.09 moles of sodium sulfate in 12 ml of solution

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.