Asample of hydrogen occupies a volume of 351 ml at a temperature of 20 degrees celsius. what is the new volume if the temperature increases to 38 degrees celsius? (do not forget to convert to kelvin! )

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?