How many atoms of nitrogen are present in 25.0 g of Ca(NO3)2?

Answer 1

You only have 2 atoms of nitrogen (if I remember correctly)! You have 6 oxygens because you have 3 inside the parentheses and you multiply that by 2, but you only have 1(one) atom of nitrogen in the parentheses and you multiply that by 2! I hope that's right and I hope that helps!!! Good luck with all that...

Ca(NO3)2

N times 2= N2
O3 times 2=O6

I hope that doesn't confuse you!!!

Answer 2

If you have the N that means nitrogen inside the pharentesis, that means that you have already three Nitrogen Atoms. The next thing you must know is that outside you are having a 2. So you do the following:

Multiply the three atoms of Nitrogen times the number outside and that would be 6. So You have

SIX ATOMS OF NITROGEN
Then you multiply by the grams you want.

Answer 3

Ok, first of all, their are 2 nitrogen atoms per molecule of Ca(NO3)2. the molecular weight of Ca(NO3)2 is 164.087 g/mol. if i remember h.s chemistry correctly that makes 12.04450 x 10^23 molecules per mole of nitrogen. divide by the molecular weight and you get approx 7.341 x 10 ^21 atoms of N per gram. multiply by 25 grams and you get 1.835 x 10 ^ 22 molecules of nitrogen with 4 digit accuracy.