1. The formula for oxalic acid is (COOH)2
The formula for oxalic acid is (COOH)2. How many atoms does each molecule contain? 6 4 8 10 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

2. What is the molecular formula for acetic acid?
CH3COOH
CH3COCH3
CH3CH2OH
CH3CH2CO2H
CH3CH2OCH2CH3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3. What is the formula for iron(III) oxide?
FeO3
FeO2
Fe3O2
Fe2O3
Fe3O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

4. Choose the name-formula pair that does not correctly match.
magnesium phosphate Mg3(PO4)2
ferrous sulfite FeSO3
silver carbonate AgCO3
potassium fluoride KF
cupric bromide CuBr2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

5. If g of calcium combines exactly with g of bromine and g of zinc combines exactly with g of bromine, what is the mass ratio of one atom of calcium to one atom of zinc?
1.68
0.613
0.541
1.85
0.133 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

6. Calculate the number of atoms in 40.5 g of aluminum.
900
2.5 x 10-24
9.0 x 1023
6.6 x 1026
1.8 x 10-21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

7. What is the formula weight of Fe(NH4)2(SO4)2•6H2O?
392 amu
384 amu
412 amu
376 amu
436 amu 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

8. How many atoms of hydrogen are there in 88 g of C6H6?
3.6 x 1023
6.8 x 1022
2.6 x 1023
4.1 x 1024
5.3 x 1023 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

9. How many hydrogen atoms are present in 7.50 g of (NH4)2Fe(SO4)2•6H2O?
5.16 x 1022
2.30 x 1023
1.15 x 1022
4.65 x 1023
3.35 x 1024 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

10. Calculate the percent composition of FeSO4.1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

11. What would be the empirical formula for a compound containing 33
What would be the empirical formula for a compound containing 33.36% calcium, 26.69% sulfur, and 39.95% oxygen?
CaSO4
CaSO2
CaSO
CaSO3
Ca2S2O5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

12. The complete combustion of a hydrocarbon produced 352 mg of CO2 and 216 mg of H2O. What is the simplest formula of this hydrocarbon? CH
C2H3
CH3
C3H2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

13. The complete combustion of a hydrocarbon produced 26. 4 g of CO2 and 5
The complete combustion of a hydrocarbon produced 26.4 g of CO2 and 5.40 g of H2O. Another experiment determined the molecular weight of this hydrocarbon to be approximately 52 g/mol. What is its molecular formula?
C2H4 CH
C4H4
C2H2
CH4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

14. What mass of lead is present in 5.05 kg of mendipite, PbCl2•2PbO?1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

15. What mass of fluorine is contained in 2.00 tons of cryolite that is 42.0% pure Na3A1F6? (No other compounds containing fluorine are present.)
912 lb
832 lb
456 lb
304 lb
152 lb 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50