We're supposed to find how many moles and atoms/molecules in each compound/element. I am almost completely lost... I know theres something to do with taking the mass and dividing it by the formula weight and multiplying it by 6.02 x 10^23, but i don't know if that's just for moles or if its molecules/atoms... or both? I'm about to rip my hair out Can someone PLEASE PLEASE PLEASE help? (i.e. Calcium Chloride, CaCl2 2H2O, 14.439 g of it.)
2007-11-01 06:08:10 · 3 answers · asked by NoID 2 in Science & Mathematics ➔ Chemistry
There are 6.02 x 10^23 molecules in a mole (granm molecular weight) or atoms in a gram-atom (gram atomic weight).
Atomic weights: Ca=40 Cl=35.5 H=1 O=16 H2O=18 CaCl2*2H2O=147 Let calcium chloride dihydrate be called CCD
How many calcium atoms in 14.439g CCD?
14.439gCCD x 1molCCD/147gCCD x 1molCa/1molCCD x 6.02x10^23atomsCa/1molCa = 5.91 x 10^22 atoms Ca to three significant figures.
How many total atoms in that much CCD? Work it out, knowing there are 9 moles atoms/1 mole CCD
2007-11-01 06:23:13 · answer #1 · answered by steve_geo1 7 · 1⤊ 0⤋
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2016-05-17 03:11:08 · answer #2 · answered by Jo-ann 4 · 0⤊ 0⤋
matler balances are very gud at doing this- first take tan (10)atoms and set the weight . then poot the mass on it, it will show the namber of atoms diractly.
2007-11-01 06:45:26 · answer #3 · answered by Anonymous · 0⤊ 0⤋