Question 1

How many moles are there in 82.5 grams of iron?

Accepted Answer

A) 4.97 × 1025 
B) 55.85 
C) 0.677 
D) 1.48 
E) none of the above 
A) 4.97 × 1025 
B) 55.85 
C) 0.677 
D) 1.48 
E) none of the above

Question 2

How many moles of fluorine are in 3.2 moles of xenon hexafluoride?

Accepted Answer

A) 22.4 
B) 12.8 
C) 19.2 
D) 16 
E) none of the above 
A) 22.4 
B) 12.8 
C) 19.2 
D) 16 
E) none of the above

Question 3

What is the molar mass of aluminum sulfate?

Accepted Answer

A) 123.0 g/mol 
B) 278.0 g/mol 
C) 306.2 g/mol 
D) 315.2 g/mol 
E) 342.2 g/mol 
A) 123.0 g/mol 
B) 278.0 g/mol 
C) 306.2 g/mol 
D) 315.2 g/mol 
E) 342.2 g/mol

Question 4

C2H3O2 could be an empirical formula.

Accepted Answer

A) True 
 B)False

Question 5

What is the mass percent of hydrogen in water?

Accepted Answer

A) 33.3 
B) 88.8 
C) 5.60 
D) 11.2 
E) none of the above 
A) 33.3 
B) 88.8 
C) 5.60 
D) 11.2 
E) none of the above

Question 6

A 42.7 gram sample of potassium nitrate contains how many grams of potassium?

Accepted Answer

A) 39.1 
B) 16.5 
C) 21.4 
D) 8.54 
E) none of the above 
A) 39.1 
B) 16.5 
C) 21.4 
D) 8.54 
E) none of the above

Question 7

If 3.011 ×1023 molecules have a mass of 20.04 grams,what is the molar mass of this substance?

Accepted Answer

A) 40.08 g/mol 
B) 10.02 g/mol 
C) 20.04 g/mol 
D) 6.658 ×   g/mol 
E) none of the above 
A) 40.08 g/mol 
B) 10.02 g/mol 
C) 20.04 g/mol 
D) 6.658 ×   g/mol 
E) none of the above

Question 8

What is the mass of 1.56 × 1021 atoms of magnesium in grams?

Accepted Answer

A) 4.72 × 10-5 
B) 0.0630 
C) 0.142 
D) 1.07 × 10-4 
E) none of the above 
A) 4.72 × 10-5 
B) 0.0630 
C) 0.142 
D) 1.07 × 10-4 
E) none of the above

Question 9

How many moles of bromine gas are in 37.7 grams?

Accepted Answer

A) 0.236 
B) 0.472 
C) 3.01 × 103 
D) 79.9 
E) none of the above 
A) 0.236 
B) 0.472 
C) 3.01 × 103 
D) 79.9 
E) none of the above

Question 10

A chromium oxide compound contains 104.0 grams of chromium and 48.0 grams of oxygen.What is the most likely empirical formula of this compound?

Accepted Answer

A) CrO 
B) CrO2 
C) CrO3 
D) Cr2O3 
E) Cr3O2 
A) CrO 
B) CrO2 
C) CrO3 
D) Cr2O3 
E) Cr3O2

Question 11

One mole of copper atoms is 6.022 × 1023 copper atoms.

Accepted Answer

A) True 
 B)False

Question 12

The empirical formula mass must be 25.0 if the molecular formula mass is 250 and n = 5.

Accepted Answer

A) True 
 B)False

Question 13

What would the empirical formula be for the molecular compound C6H9O4?

Accepted Answer

A) C2H3O2 
B) CH3O2 
C) C3H6O2 
D) C3H9O4 
E) none of the above 
A) C2H3O2 
B) CH3O2 
C) C3H6O2 
D) C3H9O4 
E) none of the above

Question 14

Two moles of cobalt atoms have a mass of 117.87 grams.

Accepted Answer

A) True 
 B)False

Question 15

The number 6.022 ×   is six times larger than the number 6.022 ×   .

Accepted Answer

A) True 
 B)False

Question 16

How many hydrogen atoms are in 35.0 grams of hydrogen gas?

Accepted Answer

A) 4.25 × 1025 
B) 2.09 × 1025 
C) 2.12 × 1025 
D) 1.05 × 1025 
E) none of the above 
A) 4.25 × 1025 
B) 2.09 × 1025 
C) 2.12 × 1025 
D) 1.05 × 1025 
E) none of the above

Question 17

How many moles of oxygen are in 3.30 moles of NaClO4 ?

Accepted Answer

A) 3.30 
B) 0.303 
C) 19.0 
D) 13.2 
E) none of the above 
A) 3.30 
B) 0.303 
C) 19.0 
D) 13.2 
E) none of the above

Question 18

A compound composed of only carbon and hydrogen is 25.2% hydrogen by mass.The empirical formula for this compound is:

Accepted Answer

A) CH0.25 
B) C3H 
C) CH4 
D) C2H8 
E) none of the above 
A) CH0.25 
B) C3H 
C) CH4 
D) C2H8 
E) none of the above

Question 19

If 2.01 ×   atoms of an element from Group IA of the periodic table has a mass of 7.675 grams,this element is most likely:

Accepted Answer

A) Li. 
B) Na. 
C) K. 
D) Rb. 
E) Cs. 
A) Li. 
B) Na. 
C) K. 
D) Rb. 
E) Cs.

Question 20

One mole of ammonium nitrate contains:

Accepted Answer

A) 3 moles of hydrogen. 
B) 2 moles of oxygen. 
C) 2 moles of nitrogen. 
D) 1 mole of nitrogen. 
E) none of the above 
A) 3 moles of hydrogen. 
B) 2 moles of oxygen. 
C) 2 moles of nitrogen. 
D) 1 mole of nitrogen. 
E) none of the above

How many moles are there in 82.5 grams of iron?

How many moles of fluorine are in 3.2 moles of xenon hexafluoride?

What is the molar mass of aluminum sulfate?

C₂H₃O₂ could be an empirical formula.

What is the mass percent of hydrogen in water?

A 42.7 gram sample of potassium nitrate contains how many grams of potassium?

If 3.011 ×10²³ molecules have a mass of 20.04 grams,what is the molar mass of this substance?

What is the mass of 1.56 × 10²¹ atoms of magnesium in grams?

How many moles of bromine gas are in 37.7 grams?

A chromium oxide compound contains 104.0 grams of chromium and 48.0 grams of oxygen.What is the most likely empirical formula of this compound?

One mole of copper atoms is 6.022 × 10²³ copper atoms.

The empirical formula mass must be 25.0 if the molecular formula mass is 250 and n = 5.

What would the empirical formula be for the molecular compound C₆H₉O₄?

Two moles of cobalt atoms have a mass of 117.87 grams.

The number 6.022 × is six times larger than the number 6.022 × .

How many hydrogen atoms are in 35.0 grams of hydrogen gas?

How many moles of oxygen are in 3.30 moles of NaClO₄?

A compound composed of only carbon and hydrogen is 25.2% hydrogen by mass.The empirical formula for this compound is:

If 2.01 × atoms of an element from Group IA of the periodic table has a mass of 7.675 grams,this element is most likely:

One mole of ammonium nitrate contains:

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Exam 6: Chemical Composition

How many moles are there in 82.5 grams of iron?

How many moles of fluorine are in 3.2 moles of xenon hexafluoride?

What is the molar mass of aluminum sulfate?

C2H3O2 could be an empirical formula.

What is the mass percent of hydrogen in water?

A 42.7 gram sample of potassium nitrate contains how many grams of potassium?

If 3.011 ×1023 molecules have a mass of 20.04 grams,what is the molar mass of this substance?

What is the mass of 1.56 × 1021 atoms of magnesium in grams?

How many moles of bromine gas are in 37.7 grams?

A chromium oxide compound contains 104.0 grams of chromium and 48.0 grams of oxygen.What is the most likely empirical formula of this compound?

One mole of copper atoms is 6.022 × 1023 copper atoms.

The empirical formula mass must be 25.0 if the molecular formula mass is 250 and n = 5.

What would the empirical formula be for the molecular compound C6H9O4?

Two moles of cobalt atoms have a mass of 117.87 grams.

The number 6.022 × is six times larger than the number 6.022 × .

How many hydrogen atoms are in 35.0 grams of hydrogen gas?

How many moles of oxygen are in 3.30 moles of NaClO4 ?

A compound composed of only carbon and hydrogen is 25.2% hydrogen by mass.The empirical formula for this compound is:

If 2.01 × atoms of an element from Group IA of the periodic table has a mass of 7.675 grams,this element is most likely:

One mole of ammonium nitrate contains:

The Chemical World

Measurement and Problem Solving

Matter and Energy

Atoms and Elements

Molecules and Compounds

Chemical Reactions

Quantities in Chemical Reactions

Electrons in Atoms and the Periodic Table

Chemical Bonding

Gases

Liquids, solids, and Intermolecular Forces

Solutions

Acids and Bases

Chemical Equilibrium

Oxidation and Reduction

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

C₂H₃O₂ could be an empirical formula.

If 3.011 ×10²³ molecules have a mass of 20.04 grams,what is the molar mass of this substance?

What is the mass of 1.56 × 10²¹ atoms of magnesium in grams?

One mole of copper atoms is 6.022 × 10²³ copper atoms.

What would the empirical formula be for the molecular compound C₆H₉O₄?

How many moles of oxygen are in 3.30 moles of NaClO₄?