Deck 7: Quantitative Composition of Compounds

Question 1

What is the mass of 1.36 10²² molecules of HCl?

A)0.824g
B)1610g
C)36.5g
D)136g

Answer 1

0.824g

Question 2

How many molecules are present in 0.340g of HCl?

A)1.78 10^-22
B)6.46 10²⁵
C)5.61 10²¹
D)2.06 10^-23

Answer 2

5.61 10²¹

Question 3

How many moles of chloride ions are present in 18.4g of CaCl₂?

A)0.332 moles
B)0.166 moles
C)6.03 moles
D)184 moles

Answer 3

0.332 moles

Question 4

How many moles are present in 140.g of CaCl₂?

A)15500 moles
B)1.46 moles
C)1.26 moles
D)0.793 moles

Question 5

What is the mass of 1.80 moles of MgSO₄?

A)1.80g
B)10.8g
C)217g
D)1.08 10²⁴ g

Question 6

What is the mass of 4.36 10²³ molecules of CCl₄?

A)312g
B)212g
C)111g
D)154g

Question 7

How many moles are present in a sample of HCl with a mass of 3.65g?

A)3.46 moles
B)0.100 moles
C)2.19 10²⁴ moles
D)10.0 moles

Question 8

What is the mass of one mole of HCl?

A)1.01g
B)6 10²³ g
C)35.45g
D)36.46g

Question 9

How many units of AgNO₃ are present in 147g of this compound?

A)4.15 10^-20
B)5.21 10²³
C)1.47 10²¹
D)6.96 10²³

Question 10

How many O atoms are present in 1.04 moles of MgSO₄?

A)1.04 10²³ atoms
B)4.16 10²³ atoms
C)2.51 10²⁴ atoms
D)6.26 10²³ atoms

Question 11

How many molecules are present in 146g of HCl?

A)3.20 10²⁷
B)8.84 10^-21
C)2.41 10²⁴
D)1.50 10²³

Question 12

How many chloride ions are present in 347g of CaCl₂?

A)1.88 10²⁴
B)1.93 10²³
C)3.77 10²⁴
D)6.40 10^-20

Question 13

What is the mass of 0.118 moles of AgNO₃?

A)0.118 g
B)0.710g
C)7.10 10²³ g.
D)20.0g

Question 14

How many units of MgSO₄ are present in 18.0g of this compound?

A)6.02 10²³
B)3.60 10^-21
C)4.03 10²⁴
D)9.00 10²²

Question 15

What is the mass of 0.360 moles of HCl?

A)0.360g
B)13.1g
C)101g
D)2.17 10²³ g

Question 16

How many units of AgNO₃ are present in 1.36g of this compound?

A)3.84 X 10^-22
B)4.82 X 10 ²¹
C)1.36 X 10²³
D)7.52 X 10²⁵

Question 17

How many moles of silver ions are present in 32.46g of AgNO₃?

A)0.191 moles
B)5520 moles
C)5.23 moles
D)32.5 moles

Question 18

How many moles are present in 0.140g of HCl?

A)0.140 moles
B)0.00384 moles
C)1.40 moles
D)5.01 moles

Question 19

How many moles are present in 1.64g of MgSO₄?

A)0.734 moles
B)1.64 moles
C)120.Moles
D)0.0136 moles

Question 20

What is the mass of 3.61 moles of CaCl₂?

A)3.61g
B)21.7g
C)21.7 10²³ g
D)401g

Question 21

How many molecules are present in 1.30 moles of CCl₄?

A)2.00 10²⁵
B)7.83 10²³
C)1.30 10²³
D)7.83 10²⁴

Question 22

How many molecules are present in 0.500 moles of CH₄?

A)3.01 10²³
B)6.02 10²³
C)8.00 10²³
D)5.00 10²²

Question 23

How many chlorine atoms are present in 0.778 moles of Cl₂?

A)4.69 10²³
B)9.37 10²³
C)2.34 10²³
D)1.56

Question 24

How many molecules are present in 4.21 moles of HBr?

A)1.53 10²⁵
B)2.53 10²⁵
C)4.21 10²³
D)2.53 10²⁴

Question 25

How many moles of hydrogen atoms are present in 2.41 10²⁴ molecules of CH₄?

A)0.250
B)4.00
C)1.00
D)16.0

Question 26

How many moles are present in 1.51 10²³ molecules of HCl?

A)9.12
B)0.251
C)3.99
D)146

Question 27

How many moles are present in 6.02 10²⁴ molecules of I₂?

A)0.100
B)1.00
C)10.0
D)100.

Question 28

What is the molar mass of KClO₃?

A)90.55g
B)122.55g
C)161.45g
D)6.02 10²³ g

Question 29

What is the mass of 3.06 10²² molecules of CO₂?

A)135g
B)2.24g
C)14.4g
D)866g

Question 30

How many moles are present in 1.21 10²⁴ molecules of HBr?

A)7.28
B)0.500
C)2.01
D)0.201

Question 31

How many moles are present in 6.02 10²² molecules of I₂?

A)0.100
B)1.00
C)10.0
D)100.

Question 32

What is the mass of 2.00 10²³ molecules of H₂O?

A)5.99g
B)54.2g
C)18.0g
D)36.0g

Question 33

What is the mass of 1.20 10²³ molecules of CH₃OH?

A)161g
B)38.5g
C)6.39g
D)32.1g

Question 34

What is the molar mass of sodium chloride?

A)6.02 10²³ g
B)1.00g
C)67.53g
D)58.44g

Question 35

What is the molar mass of Mg(ClO₄)₂?

A)223.21g
B)1.00g
C)301.01g
D)187.76g

Question 36

How many molecules of CH₃OH will contain 3.20 x 10²³ H atoms?

A)3.20 10²³
B)1.07 10²³
C)8.00 10²²
D)1.28 10²⁴

Question 37

How many molecules are present in 0.300 moles of HI?

A)2.43 10²⁴
B)1.81 10²³
C)2.01 10²⁴
D)3.00 10²²

Question 38

What is the mass of 3.01 10²⁴ molecules of Cl₂?

A)137g
B)14.2g
C)213g
D)355g

Question 39

How many moles are present in 3.01 10²³ molecules of CH₄?

A)48.0
B)0.500
C)8.00
D)2.00

Question 40

How many molecules are present in 4.00 moles of Cl₂?

A)1.51 10²³
B)2.41 10²⁴
C)7.09 10²⁴
D)2.84 10²⁵

Question 41

What is the percent by mass of hydrogen in NaHCO₃?

A)27.4%
B)1.20%
C)24.7%
D)44.2%

Question 42

A compound is found to consist of 1.37g of iron and 2.62g of chlorine.What is the percent by mass of chlorine in the compound?

A)34.3%
B)65.7%
C)52.3%
D)87.6%

Question 43

A substance is known to contain 2.00 g of carbon for every 5.33 g of oxygen.How many grams of carbon will be present in 55.0 g of this substance?

A)15.0 g
B)27.5 g
C)20.6 g
D)10.3 g

Question 44

What is the percent by mass of chlorine in Ca(ClO₃)₂?

A)20.7%
B)34.3%
C)38.7%
D)22.8%

Question 45

How many grams of carbon are present in 45.0 g of CCl₄?

A)0.293 g
B)3.51 g
C)5.76 g
D)41.49 g

Question 46

What is the molar mass of CaSO₄?

A)88.14g
B)136.14g
C)184.30g
D)232.32g

Question 47

A compound is found to consist of 2.89g of calcium and 5.11g of chlorine.What is the percent by mass of calcium in the compound?

A)56.6%
B)36.1%
C)63.9%
D)100%

Question 48

A 6.00g sample of calcium sulfide is found to contain 3.33g of calcium.What is the percent by mass of sulfur in the compound?

A)80.2%
B)35.7%
C)44.5%
D)28.6%

Question 49

How many grams of oxygen are present in 76.8 g of CO₂?

A)1.75 g
B)55.8 g
C)27.9 g
D)48.9 g

Question 50

A substance is found to consist of 1.900g of silver,0.250g of nitrogen,and 0.850g of oxygen.What is the percent by mass of oxygen in the compound?

A)28.3%
B)8.33%
C)63.3%
D)85.0%

Question 51

What is the empirical formula of a substance that consists of 85.60% carbon and 14.40% hydrogen?

A)CH
B)CH₂
C)CH₃
D)CH₄

Question 52

What is the percent by mass of hydrogen in sulfuric acid?

A)1.04%
B)2.06%
C)4.03%
D)5.93%

Question 53

A 10.00g sample of a substance is found to contain 5.12g of water.What is the percent by mass of water in the compound?

A)5.12%
B)4.88%
C)48.8%
D)51.2%

Question 54

A 5.00g sample of potassium chloride is found to contain 2.62g of potassium.What is the percent by mass of potassium in the compound?

A)90.8%
B)47.6%
C)52.4%
D)34.4%

Question 55

What is the molar mass of Sr(NO₃)₂?

A)117.63g
B)181.63g
C)237.67g
D)211.64g

Question 56

What is the percent by mass of carbon in carbon dioxide?

A)3.66%
B)366%
C)27.28%
D)42.9%

Question 57

A compound is known to consist of 19.36% carbon,3.25% hydrogen,and the rest is oxygen.How many grams of this compound will be needed in order to have 23.5 g of oxygen?

A)30.4 g
B)104 g
C)80.4 g
D)53.1 g

Question 58

What is the molar mass of carbon tetrachloride?

A)47.46g
B)82.91g
C)118.36g
D)153.81g

Question 59

What is the percent by mass of oxygen in water?

A)11.2%
B)88.8%
C)5.94%
D)94.1%

Question 60

What is the percent by mass of hydrogen in HC₂H₃O₂?

A)1.68%
B)5.05%
C)6.73%
D)53.3%

Question 61

A 65.2 g sample of a compound contains 32.1 g of phosphorus and the rest is oxygen.What is the empirical formula of the compound?

A)P₃O₂
B)PO₂
C)PO
D)P₂O₃

Question 62

What is the molecular formula of a compound with the empirical formula CH and molar mass of 26.04g?

A)CH
B)C₂H
C)CH₂
D)C₂H₂

Question 63

What is the empirical formula of a substance that consists of 3.704g aluminum and 3.295g oxygen?

A)AlO
B)AlO₂
C)Al₂O₃
D)Al₃O₂

Question 64

What is the empirical formula of a substance that consists of 32.86% potassium and 67.14% bromine?

A)KBr
B)K₂Br
C)KBr₂
D)K₂Br₃

Question 65

What is the empirical formula of a substance that consists of 0.910g calcium,0.636g nitrogen,and 1.453g oxygen?

A)CaNO
B)Ca₂NO₇
C)CaN₂O₄
D)CaN₂O₆

Question 66

Which statement is incorrect?

A)One mole contains 6.02 10²³ molecules.
B)One molar mass equals one mole.
C)One mole equals 6.02 10²³ g of a compound.
D)One mole of water contains the same number of molecules as one mole of carbon dioxide.

Question 67

All the following contain the same number of molecules except

A)64.06g of sulfur dioxide molecules
B)One mole of water molecules
C)88.02g of carbon dioxide molecules
D)2.02g of hydrogen molecules

Question 68

What is the molecular formula of a compound with the empirical formula CH₂O and molar mass of 180.18g?

A)CH₂O
B)C₂H₄O₂
C)C₄H₈O₄
D)C₆H₁₂O₆

Question 69

What is the molecular formula of a compound with the empirical formula C₁₃H₁₉O₂ and molar mass of 414.64g?

A)CHO
B)C₁₃H₁₉O₂
C)C₂₆H₃₈O₄
D)C₃₉H₅₇O₆

Question 70

In which pair would both compounds have the same empirical formula?

A)H₂O and H₂O₂
B)BaSO₄ and BaSO₃
C)FeO and Fe₂O₃
D)C₆H₁₂O₆ and HC₂H₃O₂

Question 71

What is the empirical formula of a compound that consists of 39.99% carbon,6.73% hydrogen,and 53.28% oxygen?

A)CHO
B)C₂HO
C)CH₂O
D)CHO₂

Question 72

What is the molecular formula of a compound with the empirical formula CH₂Cl and molar mass of 98.96g?

A)CH₂Cl
B)C₂H₄Cl₂
C)C₃H₆Cl₃
D)C₄H₈Cl₄

Question 73

One atom of sulfur has a mass of

A)5.33 10^-23 g
B)32.06g
C)1.88 10²² g
D)1.93 10²⁵ g

Question 74

In which pair would both compounds have the same empirical formula?

A)C₂H₄ and C₃H₆
B)K₂CrO₄ and K₂Cr₂O₇
C)NaHCO₃ and Na₂CO₃
D)FeCl₃ and FeCl₂

Question 75

A 30.5 g sample of a compound contains 9.29 g of nitrogen and the rest is oxygen.What is the empirical formula of the compound?

A)N₂O₃
B)N₂O
C)NO
D)NO₂

Question 76

What is the molecular formula of a compound with the empirical formula CHO₂ and molar mass of 90.04g?

A)CHO₂
B)C₂H₂O₄
C)C₃H₃O₆
D)C₄H₄O₈

Question 77

What is the empirical formula of a compound that consists of 2.424g magnesium,3.197g sulfur,and 6.380g oxygen?

A)MgSO
B)Mg₂SO₄
C)MgSO₄
D)MgSO₃

Question 78

A compound consists of 4.50 g of nitrogen for every 7.71 g of oxygen and has the same empirical and molecular formula.Identify the compound.

A)NO₂
B)N₂O
C)N₂O₃
D)NO₃

Question 79

One atom of magnesium has a mass of

A)24.31g
B)4.04 10^-23 g
C)2.48 10²² g
D)6.02 10²³ g

Question 80

What is the molecular formula of a compound with the empirical formula CH₂O and molar mass of 60.06g?

A)CH₂O
B)C₂H₄O₂
C)C₃H₆O₃
D)C₄H₈O₄