A sample of Sr weighs 60.7 grams. Will a sample of Hg that contains the same number of atoms weigh more or less than 60.7 grams? (more, less): fill in the blank 1 Calculate the mass of a sample of Hg that contains the same number of atoms.
grams of Hg

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?

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.

What does a numerical subscript following an element in a chemical formula mean?