Q1:
How many moles of atoms are there in 12 g of carbon-12?
Q2:
How many oxygen atoms are there in 192 g of ? Give your answer to 2 decimal places. [ = 16 g/mol]
- A atoms
- B atoms
- C atoms
- D atoms
- E atoms
Q3:
Copper is commonly used to fabricate electrical wire. How many copper atoms are in 5.00 g of copper wire? Give your answer to 2 decimal places. []
- A atoms
- B atoms
- C atoms
- D
- E atoms
Q4:
The recommended daily intake of selenium for an adult is approximately 0.068 mg. How many moles of selenium is this? Give your answer to 2 decimal places. []
- A
- B
- C
- D
- E
Q5:
How many oxygen atoms are there in moles of ? Give your answer to 1 decimal place.
- A atoms
- B atoms
- C atoms
- D atoms
- E atoms
Q6:
What is the mass of 0.443 mol of hydrazine ? Give your answer to 1 decimal place. [ = 1 g/mol, = 14 g/mol]
Q7:
What is the mass of mol of ammonium sulfate? Give your answer in grams and to 3 decimal places. [, , , ]
- A 0.287 g
- B 0.285 g
- C 0.328 g
- D 0.333 g
- E 0.403 g
Q8:
The mass of a substance , its molar mass , and the number of moles can be related by a single formula. What is that formula?
- A
- B
- C
- D
- E
Q9:
A prospector panning for gold in a river collects 15.81 g of pure gold. Calculate, to 2 decimal places, the number of atoms in this quantity of gold. []
- A atoms
- B atoms
- C atoms
- D atoms
- E atoms
Q10:
What mass of sodium contains the same number of moles as 12.0 g of copper? Give your answer to 2 decimal places. [, ]
Q11:
Which isotope is used as a reference in the definition of a mole?
- A Beryllium-9
- B Carbon-13
- C Carbon-12
- D Hydrogen-1
- E Oxygen-16
Q12:
How many moles of oxygen atoms are there in molecules of sulfur dioxide ()?
Q13:
Sulfuric acid has a relative formula mass of 98 g/mol. What is the mass of 2.5 mol of sulfuric acid?
Q14:
Ammonia has a relative formula mass of 17. How many moles of ammonia molecules are there in 34 g of ammonia?
Q15:
How is the atomic mass unit (u) defined?
- A 1 u is equal to the mass of a neutron.
- B 1 u is equal to th of the mass of a carbon-12 atom.
- C 1 u is equal to the mass of a proton.
- D 1 u is equal to the mass of a carbon-12 atom.
- E 1 u is equal to the mass of a hydrogen-1 atom.
Q16:
Which of the following contains a lower number of moles of the solute?
- A 10 mL of solution
- B 40 mL of solution
- C 30 mL of solution
- D 20 mL of solution
Q17:
A 24 g sample of lithium hydride contains 3.0 moles of units. What is the relative formula mass of lithium hydride?
Q18:
What is the mass, in grams, of 1 atom of sodium? Give your answer to 1 decimal place. []
- A g
- B g
- C g
- D g
- E g
Q19:
How many moles of copper are there in atoms of copper?
- A
- B moles
- C moles
- D moles
- E moles
Q20:
How many hydroxide ions are there in 2.5 moles of ? Give your answer to 1 decimal place.
- A ions
- B ions
- C ions
- D ions
- E ions
Q21:
To 2 decimal places, how many atomic mass units (u) are there in one gram (g) of a substance?
- A
- B
- C
- D
- E
Q22:
Diamond is one form of elemental carbon. An engagement ring contains a diamond weighing 1.5 karats (1 karat = 200 mg). How many atoms are present in the diamond? Express your answer in scientific notation and round it to 1 decimal place. [ = 12 g/mol]
- A atoms
- B atoms
- C atoms
- D atoms
- E atoms
Q23:
The approximate daily dietary requirement of the amino acid leucine, , is 15 mg/kg of body weight. For a 65 kg person, what is this requirement in millimoles? [ = 1 g/mol, = 12 g/mol, = 14 g/mol, = 16 g/mol]
Q24:
Which of the following samples contains the greatest number of oxygen atoms?
- A 1.5 moles of
- B 1.2 moles of
- C 1 mole of
- D 2 moles of
Q25:
Which has the greatest molar mass?
- One mole of ethanol
- One mole of glucose
- One mole of sodium bicarbonate
- One mole of sulfuric acid
- A B
- B C
- C D
- D A
