Unit 4 Review Questions

The atom that serves as the relative standard for determining mass and the number of particles in a mole is:
1. hydrogen-1
2. carbon-12
3. oxygen-16
4. lead-206
The volume occupied by one mole of a gas at standard conditions is
1. 22.4 L
2. 6.02 x 10²³ L
3. 12 L
4. 1 L
The amount of substance having 6.02 x 10²³ of any kind of chemical unit is called a(n):
1. atomic weight
2. mole
3. formula
4. mass number
The molar mass of sodium oxide, Na₂O is approximately
1. 55 grams
2. 39 grams
3. 62 grams
4. 6.022 x 10²³ grams
The molar mass of butane, C₄H₁₀ is approximately:
1. 58 grams
2. 13 grams
3. 22 grams
4. 48 grams
What is the mass of two moles of gas propane gas, C₃H₈?
1. 44 grams
2. 88 grams
3. 22 grams
4. 11 grams
What volume would be occupied by two mole of propane gas, C₃H₈, at standard conditions?
1. 44.8 liters
2. 88 liters
3. 22. 4 liters
4. 11.2 liters
How many moles of propane gas, C₃H₈, are contained in 11 grams of the gas at standard conditions?
1. 0.25 moles
2. 1.5 x 10²³ moles
3. 4 moles
4. 11 x 10²³ moles
How many molecules are contained in 3 moles of water molecules, H₂O?
1. 54 molecules
2. 6 molecules
3. 1.8 x 10²⁴ molecules
4. 3 x 10²³ molecules
What is the mass of 4 moles of hydrogen molecules (H₂)?
1. 0.5 grams
2. 8 grams
3. 2 grams
4. 4 grams
What volume is occupied by 4 moles of hydrogen molecules (H₂) at standard conditions?
1. 89.6 liters
2. 72 liters
3. 5.6 liters
4. 2.4 x 10²⁴ molecules
How many moles of hydrogen molecules (H₂) are present in 9 x 10²³ molecules of hydrogen?
1. 9 x 10²³ moles
2. 1.5 moles
3. 1.8 x 10²⁴ moles
4. 4.5 x 10²³ mole
What volume is occupied by 10 moles of ammonia, NH₃, at standard conditions?
1. 170 liters
2. 6 x 10²⁴ liters
3. 224 liters
4. 32.4 moles
How many molecules of ammonia are contained in 10 moles of ammonia, NH₃?
1. 6 x 10²⁴ molecules
2. 6 x 10²² molecules
3. 170 molecules
4. 27 molecules
How many moles of water molecules, H₂O, are present in a 27 gram sample of water?
1. 2 moles
2. 2/3 mole
3. 1.5 moles
4. 9 x 10²³ moles
How many moles of methane molecules, CH₄, are in 80 grams of methane?
1. 0.201 moles
2. 5 moles
3. 80 x 10²³ moles
4. 6.02 x 10⁸⁰ moles
How many moles of methane gas molecules, CH₄, are in 11.2 liters of methane at standard conditions?
1. 0.5 moles
2. 11.2 moles
3. 27.2 moles
4. 179.2 moles
What is the volume occupied by 40 grams of argon gas (Ar) at standard conditions?
1. 1 liter
2. 22.4 liters
3. 6.02 x 10²³ liters
4. 896 liters
How many atoms are contained in 10 grams of argon gas (Ar)?
1. 10 atoms
2. 1.5 x 10²³ atoms
3. 6 x 10²⁴ atoms
4. 6 x 10²² atoms
About how many atoms of helium would be found in 2 grams of helium?
1. 6 x 10²³
2. 3 x 10²³
3. 2
4. 4.00
How many moles of ethane gas, C₂H₆ are in 15 grams of the compound?
1. 0.5 moles
2. 2 moles
3. 3 x 10²³ moles
4. 45 moles
Approximately how many atoms of carbon are present in a 120 gram sample of carbon?
1. 6 x 10²⁴ atoms
2. 6 x 10²² atoms
3. 10 atoms
4. 1440 atoms
How many moles of argon gas (Ar) are present in 5.6 liters of argon gas at standard conditions?
1. 0.25 moles
2. 5.6 moles
3. 4 moles
4. 28 moles
What volume would be occupied by 120 grams of argon gas (Ar) at standard conditions?
1. 67.2 liters
2. 3 liters
3. 120 liters
4. 0.186 liters
Al + O₂ → Al₂O₃

When the equation above is correctly balanced, the coefficient on Al is:
1. 1
2. 2
3. 3
4. 4
5. 5
Al + O₂ → Al₂O₃

When the equation above is correctly balanced, the coefficient on O₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Al + O₂ → Al₂O₃

When the equation above is correctly balanced, the coefficient on Al₂O₃ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
H₂ + N₂ → NH₃

When the equation above is correctly balanced, the coefficient on H₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
H₂ + N₂ → NH₃

When the equation above is correctly balanced, the coefficient on N₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
H₂ + N₂ → NH₃

When the equation above is correctly balanced, the coefficient on NH₃ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
C₂H₂ + O₂ → CO₂ + H₂O

When the equation above is correctly balanced, the coefficient on C₂H₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
C₂H₂ + O₂ → CO₂ + H₂O

When the equation above is correctly balanced, the coefficient on O₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
C₂H₂ + O₂ → CO₂ + H₂O

When the equation above is correctly balanced, the coefficient on CO₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
C₂H₂ + O₂ → CO₂ + H₂O

When the equation above is correctly balanced, the coefficient on H₂O is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O

When the equation above is correctly balanced, the coefficient on Ca(OH)₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O

When the equation above is correctly balanced, the coefficient on H₃PO₄ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O

When the equation above is correctly balanced, the coefficient on Ca₃(PO₄)₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O

When the equation above is correctly balanced, the coefficient on H₂O is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ca(OH)₂ → CaO + H₂O

When the equation above is correctly balanced, the coefficient on Ca(OH)₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ca(OH)₂ → CaO + H₂O

When the equation above is correctly balanced, the coefficient on CaO is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ca(OH)₂ → CaO + H₂O

When the equation above is correctly balanced, the coefficient on H₂O is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Na + H₂O → NaOH + H₂

When the equation above is correctly balanced, the coefficient on Na is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Na + H₂O → NaOH + H₂

When the equation above is correctly balanced, the coefficient on H₂O is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Na + H₂O → NaOH + H₂

When the equation above is correctly balanced, the coefficient on NaOH is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Na + H₂O → NaOH + H₂

When the equation above is correctly balanced, the coefficient on H₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ni(ClO₃)₂ → NiCl₂ + O₂

When the equation above is correctly balanced, the coefficient on Ni(ClO₃)₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ni(ClO₃)₂ → NiCl₂ + O₂

When the equation above is correctly balanced, the coefficient on NiCl₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
Ni(ClO₃)₂ → NiCl₂ + O₂

When the equation above is correctly balanced, the coefficient on O₂ is:
1. 1
2. 2
3. 3
4. 4
5. 5
6. 6

Unit 4 Review Questions

Multiple-choice exercise