The element with the greatest density is osmium, which has
adensity of 22.6g/ cm3
calculate the mass of 32.1cm2 osmium.

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it

Ab c or d ? i’m not sure what the answer is

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)