Worksheet: Number of Atoms


Write the total number of each type of atom in each of the following elements, compounds, or reactions. If any one element occurs more than once, please put an * next to it in your totals.

Examples:

(Hg2)3(PO4)2
Hg = (2)(3) = 6
P = (1)(2) = 2
O = (4)(2) = 8
Total = 16

3NH4OH
N = (1) = 1x3 = 3
*H = (4)+(1) = 5x3 = 15
O = (1)= 1X3 = 3
Total = 21

Problems

1) H2O

2) C6H12

3) 2NaCl

4) 3H2O

5) Ag2(SO4)3

6) Pb(NO3)3 + PbCl2

7) 3Al2Br3 + Al(NO3)3

8) 2(NH4)2C2O4 + 6NO3

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