Question

How many atoms are in CHOFeNaNPb2
a.7
b.8
c.9
d.10

Answer 1

1+1+1+1+1+1+2=8

because

C, H, O, Fe, Na, N are one atom each

+ we have two atoms of Pb because we have an index 2

we just collect them

1 + 1 + 1 + 1 + 1 + 1 +2 =8