Question 1

One mole of I2 has more atoms in it than one mole of Na.

Accepted Answer

A) True 
 B)False

Question 2

In comparing a balloon containing 25 grams of helium to a balloon containing 25 grams of neon,which one of the following statements is TRUE?

Accepted Answer

A) Each balloon has an equal number of atoms. 
B) The helium balloon has more atoms. 
C) The neon balloon has more atoms. 
D) This scenario cannot happen because gases have no mass. 
E) none of the above 
A) Each balloon has an equal number of atoms. 
B) The helium balloon has more atoms. 
C) The neon balloon has more atoms. 
D) This scenario cannot happen because gases have no mass. 
E) none of the above

Question 3

The molecular formula is equal to the empirical formula multiplied by a whole number integer.

Accepted Answer

A) True 
 B)False

Question 4

One mole of zinc contains 65.39 zinc atoms.

Accepted Answer

A) True 
 B)False

Question 5

One hundred nickels must have the same mass as one hundred pennies.

Accepted Answer

A) True 
 B)False

Question 6

Six grams of carbon contains 3.008 × 1023 atoms.

Accepted Answer

A) True 
 B)False

Question 7

What is the correct value for Avogadro's number?

Accepted Answer

A) 6.022 × 1023 
B) 6.022 × 1033 
C) 6.023 × 1022 
D) 6.022 × 102.3 
E) none of the above 
A) 6.022 × 1023 
B) 6.022 × 1033 
C) 6.023 × 1022 
D) 6.022 × 102.3 
E) none of the above

Question 8

If you have   atoms of copper,how many moles of copper do you have?

Accepted Answer

A) 0.250 
B) 4.00 
C) 0.600 
D) 3.00 
E) none of the above 
A) 0.250 
B) 4.00 
C) 0.600 
D) 3.00 
E) none of the above

Question 9

What is the mass percent of chlorine in hydrochloric acid?

Accepted Answer

A) 2.8 
B) 35.5 
C) 97.2 
D) 70.1 
E) none of the above 
A) 2.8 
B) 35.5 
C) 97.2 
D) 70.1 
E) none of the above

Question 10

Given that sodium chloride is 39.0% sodium by mass,how many grams of sodium chloride are needed to have   of Na present?

Accepted Answer

A) 2.44 
B) 0.371 
C) 2,430 
D) 37.1 
E) none of the above 
A) 2.44 
B) 0.371 
C) 2,430 
D) 37.1 
E) none of the above

Question 11

What is the mass of 3.09 × 1024 atoms of sulfur in grams?

Accepted Answer

A) 9.64 × 1022 
B) 9.91 × 1025 
C) 165 
D) 0.160 
E) none of the above 
A) 9.64 × 1022 
B) 9.91 × 1025 
C) 165 
D) 0.160 
E) none of the above

Question 12

What is the value of n when the empirical formula is C3H5 and the molecular mass is   ?

Accepted Answer

A) 0.02 
B) 5 
C) 10 
D) 140 
E) none of the above 
A) 0.02 
B) 5 
C) 10 
D) 140 
E) none of the above

Question 13

Water is 11.2% hydrogen by mass.

Accepted Answer

A) True 
 B)False

Question 14

The simplest formula for hydrogen peroxide is HO.To determine its molecular formula,it is necessary to know:

Accepted Answer

A) the properties of hydrogen peroxide. 
B) the density of hydrogen peroxide. 
C) the molar mass of hydrogen peroxide. 
D) the number of moles of hydrogen peroxide in 1.00 g of the substance. 
E) none of the above 
A) the properties of hydrogen peroxide. 
B) the density of hydrogen peroxide. 
C) the molar mass of hydrogen peroxide. 
D) the number of moles of hydrogen peroxide in 1.00 g of the substance. 
E) none of the above

Question 15

What is the mass in grams of 5.40 moles of lithium?

Accepted Answer

A) 6.94 
B) 37.5 
C) 1.29 
D) 3.25 × 1024 
E) none of the above 
A) 6.94 
B) 37.5 
C) 1.29 
D) 3.25 × 1024 
E) none of the above

Question 16

Determine the correct empirical formula of a compound containing 26.68% carbon,2.24% hydrogen,and 71.08% oxygen.

Accepted Answer

A) CHO 
B) CHO2 
C) C0.5H0.5O1 
D) C2H2O4 
E) none of the above 
A) CHO 
B) CHO2 
C) C0.5H0.5O1 
D) C2H2O4 
E) none of the above

Question 17

What is the molecular formula of a compound given the molar mass of the compound is   and the empirical formula is C2H7?

Accepted Answer

A) C4H14 
B) C3H21 
C) C2H7 
D) C2H14 
E) none of the above 
A) C4H14 
B) C3H21 
C) C2H7 
D) C2H14 
E) none of the above

Question 18

The empirical formula of a compound:

Accepted Answer

A) describes the mass relationships in a molecule. 
B) is the same as the molecular formula. 
C) indicates the structure of the molecule. 
D) indicates the simplest ratio of atoms in the compound. 
E) none of the above 
A) describes the mass relationships in a molecule. 
B) is the same as the molecular formula. 
C) indicates the structure of the molecule. 
D) indicates the simplest ratio of atoms in the compound. 
E) none of the above

Question 19

How many moles of Cu are in 1.48 × 1025 Cu atoms?

Accepted Answer

A) 0.0408 
B) 24.6 
C) 1.54 × 1025 
D) 6.022 × 1023 
E) none of the above 
A) 0.0408 
B) 24.6 
C) 1.54 × 1025 
D) 6.022 × 1023 
E) none of the above

Question 20

What is the mass percent of Na in sodium chloride?

Accepted Answer

A) 58.4 
B) 60.7 
C) 39.3 
D) 47.5 
E) none of the above 
A) 58.4 
B) 60.7 
C) 39.3 
D) 47.5 
E) none of the above

One mole of I₂ has more atoms in it than one mole of Na.

In comparing a balloon containing 25 grams of helium to a balloon containing 25 grams of neon,which one of the following statements is TRUE?

The molecular formula is equal to the empirical formula multiplied by a whole number integer.

One mole of zinc contains 65.39 zinc atoms.

One hundred nickels must have the same mass as one hundred pennies.

Six grams of carbon contains 3.008 × 10²³ atoms.

What is the correct value for Avogadro's number?

If you have atoms of copper,how many moles of copper do you have?

What is the mass percent of chlorine in hydrochloric acid?

Given that sodium chloride is 39.0% sodium by mass,how many grams of sodium chloride are needed to have of Na present?

What is the mass of 3.09 × 10²⁴ atoms of sulfur in grams?

What is the value of n when the empirical formula is C₃H₅ and the molecular mass is ?

Water is 11.2% hydrogen by mass.

The simplest formula for hydrogen peroxide is HO.To determine its molecular formula,it is necessary to know:

What is the mass in grams of 5.40 moles of lithium?

Determine the correct empirical formula of a compound containing 26.68% carbon,2.24% hydrogen,and 71.08% oxygen.

What is the molecular formula of a compound given the molar mass of the compound is and the empirical formula is C₂H₇?

The empirical formula of a compound:

How many moles of Cu are in 1.48 × 10²⁵ Cu atoms?

What is the mass percent of Na in sodium chloride?

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

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Exam 6: Chemical Composition

One mole of I2 has more atoms in it than one mole of Na.

In comparing a balloon containing 25 grams of helium to a balloon containing 25 grams of neon,which one of the following statements is TRUE?

The molecular formula is equal to the empirical formula multiplied by a whole number integer.

One mole of zinc contains 65.39 zinc atoms.

One hundred nickels must have the same mass as one hundred pennies.

Six grams of carbon contains 3.008 × 1023 atoms.

What is the correct value for Avogadro's number?

If you have atoms of copper,how many moles of copper do you have?

What is the mass percent of chlorine in hydrochloric acid?

Given that sodium chloride is 39.0% sodium by mass,how many grams of sodium chloride are needed to have of Na present?

What is the mass of 3.09 × 1024 atoms of sulfur in grams?

What is the value of n when the empirical formula is C3H5 and the molecular mass is ?

Water is 11.2% hydrogen by mass.

The simplest formula for hydrogen peroxide is HO.To determine its molecular formula,it is necessary to know:

What is the mass in grams of 5.40 moles of lithium?

Determine the correct empirical formula of a compound containing 26.68% carbon,2.24% hydrogen,and 71.08% oxygen.

What is the molecular formula of a compound given the molar mass of the compound is and the empirical formula is C2H7?

The empirical formula of a compound:

How many moles of Cu are in 1.48 × 1025 Cu atoms?

What is the mass percent of Na in sodium chloride?

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

One mole of I₂ has more atoms in it than one mole of Na.

Six grams of carbon contains 3.008 × 10²³ atoms.

What is the mass of 3.09 × 10²⁴ atoms of sulfur in grams?

What is the value of n when the empirical formula is C₃H₅ and the molecular mass is ?

What is the molecular formula of a compound given the molar mass of the compound is and the empirical formula is C₂H₇?

How many moles of Cu are in 1.48 × 10²⁵ Cu atoms?