At STP, which sample contains the same number of molecules as 2.0 liters of H2(g)?

How manyatoms of mercury are in 1.4214e+1 ml sample

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?