List two examples of solids, liquids, and gases

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Joan writes four numbers on the board in standard form, and then she writes their scientific notation