The formula for oxalic acid is (COOH)2. How many atoms does each molecule contain?

1
The formula for oxalic acid is (COOH)2. How many
atoms does each molecule contain?

1. 6
2. 4
3. 8
4. 10
5. 5

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2
What is the molecular formula for acetic acid?

1. CH3COOH
2. CH3COCH3
3. CH3CH2OH
4. CH3CH2CO2H
5. CH3CH2OCH2CH3

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3
What is the formula for iron(III) oxide?

1. FeO3
2. FeO2
3. Fe3O2
4. Fe2O3
5. Fe3O

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4
Choose the name-formula pair that does not
correctly match.

1. magnesium phosphate Mg3(PO4)2
2. ferrous sulfite FeSO3
3. silver carbonate AgCO3
4. potassium fluoride KF
5. cupric bromide CuBr2

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5
If 6.653 g of calcium combines exactly with 26.53
g of bromine and 12.29 g of zinc combines exactly
with 30.04 g of bromine, what is the mass ratio
of one atom of calcium to one atom of zinc?

1. 1.68
2. 0.613
3. 0.541
4. 1.85
5. 0.133

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6
Calculate the number of atoms in 40.5 g of
aluminum.

1. 900
2. 2.5 x 10-24
3. 9.0 x 1023
4. 6.6 x 1026
5. 1.8 x 10-21

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7
What is the formula weight of Fe(NH4)2(SO4)26H2O?

1. 392 amu
2. 384 amu
3. 412 amu
4. 376 amu
5. 436 amu

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8
How many atoms of hydrogen are there in 88 g of
C6H6?

1. 3.6 x 1023
2. 6.8 x 1022
3. 2.6 x 1023
4. 4.1 x 1024
5. 5.3 x 1023

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9
How many hydrogen atoms are present in 7.50 g of
(NH4)2Fe(SO4)26H2O?

1. 5.16 x 1022
2. 2.30 x 1023
3. 1.15 x 1022
4. 4.65 x 1023
5. 3.35 x 1024

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10
Calculate the percent composition of FeSO4.

1. Fe 27.9, S 24.1, O 48.0
2. Fe 16.2 , S 27.9, O 55.8
3. Fe 33.2 , S 9.5 , O 57.2
4. Fe 36.8, S 21.1, O 42.1
5. Fe 25.1, S 21.6 , O 53.2

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11
What would be the empirical formula for a
compound containing 33.36 calcium, 26.69
sulfur, and 39.95 oxygen?

1. CaSO4
2. CaSO2
3. CaSO
4. CaSO3
5. Ca2S2O5

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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?

1. CH
2. CH
3. C2H3
4. CH3
5. C3H2

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13
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?

1. C2H4
2. CH
3. C4H4
4. C2H2
5. CH4

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14
What mass of lead is present in 5.05 kg of
mendipite, PbCl22PbO?

1. 2.89 kg
2. 4.05 kg
3. 5.05 kg
4. 3.68 kg
5. 4.33 kg

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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.)

1. 912 lb
2. 832 lb
3. 456 lb
4. 304 lb
5. 152 lb

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