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

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

these nuts

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer