1) How many atoms are in the formula CaCl2? a) 2 b) 4 c) 3 d) 6 2) How many atoms are in H2? a) 1 b) 2 c) 4 d) 0 3) How many atoms are in NaCl? a) 1 b) 2 c) 3 d) 4 4) How many atoms are in 2 H20? a) 2 b) 3 c) 5 d) 6 5) How many atoms are in Fe203? a) 5 b) 6 c) 2 d) 12 6) How many atoms are in C2H4? a) 2 b) 4 c) 6 d) 8 7) How many atoms are in C4H6O3? a) 3 b) 13 c) 72 d) 30 8) How many atoms are in H2SiCl2? a) 3 b) 4 c) 5 d) 6 9) How many atoms are in C3H8O2? a) 3 b) 6 c) 13 d) 48 10) How many atoms are in C3H12O2? a) 3 b) 5 c) 72 d) 17 11) How many atoms are in 4 O2? a) 1 b) 4 c) 6 d) 8 12) How many atoms are in 7 Fe2? a) 1 b) 7 c) 9 d) 14 13) How many atoms are in 5 NaCl? a) 10 b) 6 c) 5 d) 2 14) How many atoms are in 3 SO4? a) 15 b) 12 c) 8 d) 3 e) 2 15) How many atoms are in H3PO4? a) 36 b) 12 c) 8 d) 7 e) 3 16) How many atoms are in 7HCl a) 21 b) 14 c) 9 d) 7 e) 3 17) How many atoms are in NH3PO4? a) 48 b) 14 c) 9 d) 4 18) How many atoms are in 3 PCl5? a) 30 b) 18 c) 16 d) 6 e) 3 19) How many atoms are in 2Fe2O3? a) 12 b) 10 c) 7 d) 2 20) How many atoms are in 5AgI? a) 10 b) 6 c) 5 d) 2 21) How many atoms are in (NH4)2Cr2O7? a) 16 b) 18 c) 4 d) 19 22) How many atoms are in Ca(H2PO4)2? a) 15 b) 11 c) 3 d) 16 23) How many atoms are in 5Ca(H2PO4)2 a) 24 b) 19 c) 75 d) 16 24) 3Al2 (SO4)3 a) 51 b) 21 c) 19 d) 33 25) 2 K2SO4 a) 6 b) 9 c) 8 d) 14

Counting Atoms E

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