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Multiple Choice

Molar mass is in units of ________.

• grams
• grams/mole
• mole
• moles/gram

Multiple Choice

What is the molar mass of AuCl₃?

• 96 g
• 130 g
• 232.5 g
• 303.3 g

Multiple Choice

What is the mass in grams of 5.90 mol C₈H_18?

• .0512 g
• 19.4 g
• 673 g
• 389 g

Multiple Choice

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

Multiple Choice

What is the molar mass of Hydrogen Peroxide (H₂O₂)?

• 48 g/mole
• 34.02 g/mole
• 36.5 g/mole
• 35.5 g/mole

Multiple Choice

Calculate the molar mass for Al(OH)₃

• 78.0 g/mol

• 72 g/mol

• 28 g/mol

• 25 g/mol

Multiple Choice

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

Multiple Choice

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

Multiple Choice

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol

Multiple Choice

What is the mass of one mole of aluminum?

• 27 g
• 13 g
• 54 g
• 14 g

Multiple Choice

The mass of one mole of substance is called...

• molecular mass
• mole constant
• molar mass
• atomic weight

Multiple Choice

What is the percent by mass of N in (NH₄)₂S?

• 47.1%

• 68.1%

• 44.1%

• 41.1%

Multiple Choice

How many moles are in 16.94g of water?

• 16.94 mol H₂O
• 0.9401 mol H₂O
• 305.3 mol H₂O
• 1.063 mol H₂O

Multiple Choice

(0901) Determine the number of moles in 5.2 x 10²² atoms of gold.

• 0.086 mole

• 0.52 mole

• 8.63 x 10⁴⁴ moles

• 3.1 x 10⁴⁶ moles

Multiple Choice

Which conversion factor should be used to solve the following, "How many moles in 28 grams of CO₂?"

• 1 mol =12.0 g 

• 1 mol = 44.01 g
• 1 mol = 6.02x10²³ atoms
• 44.01 g = 6.02x10²³ atoms

Multiple Choice

Which conversion factor should be used for the following question " How many molecules are there in 4.00 moles of glucose, C₆H₁₂O₆? 

• 1 mole = 180. g

• 180. 180. g = 6.02x 10²³ particles  

• 1 mol = 6.02x 10²³ particles 
• 1 molecule = 24 atoms

Multiple Choice

Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?

• A
• B
• C
• D

Multiple Choice

15.6 L = ___________ mL

• 15,600
• 156,000
• 1,560,000
• 15,600,000

Multiple Choice

Which of the following dimensional analysis setups will correctly convert 4.00x10²³atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

• setup B : 0.664 mol Co

• setup A: 2.41x10⁴⁷mol Co

• setup A : 0.664 mol Co

• setup B: 2.41x10⁴⁷mol Co

Multiple Choice

32.9 km = ___________ cm

• 32,900
• 329,000
• 3,290,000
• 32,900,000

Multiple Choice

(Hint: write out how you would solve the problem first on paper before choosing an answer.) 

How would you set up the problem if you have a sample of 2.50 g of sodium (Na), how many moles of Na do you have?

• $$2.50g\ Na\ \times\frac{22.99\ mol\ Na}{1\ g\ Na}=$$  

• $$2.50\ g\ Na\ \times\frac{1\ mol\ Na}{22.99\ g\ Na}=$$  

• $$2.50\ g\ Na\ \times\frac{22.99\ g\ Na}{1\ mol\ Na}=$$  

• $$2.50\ g\ Na\ \times\frac{1\ g\ Na\ }{22.99\ mol\ Na}=$$  

Multiple Choice

How would you set up the problem if you have 3.80 moles of calcium (Ca), and you are trying to determine how many atoms of calcium you have?

• $$3.80\ mol\ Ca\ \times\frac{40.08\ g\ Ca}{1\ mol\ Ca}=$$  

• $$3.80\ mol\ Ca\ \times\frac{6.022\ x\ 10^{23\ }atoms\ Ca}{1\ mol\ Ca}=$$  

• $$3.80\ mol\ Ca\ \times\frac{1\ g\ Ca}{40.08\ mol\ Ca}=$$  

• $$3.80\ mol\ Ca\ \times\frac{1\ atoms\ Ca}{6.022\ x\ 10^{23}\ mol\ Ca}=$$  

Multiple Choice

Which expression below show the correct method of determining the percent composition of Sodium in Na₂CO₃?

• %Na = (22.99g/106g) x 100
• %Na = (22.99g/106) / 100
• %Na = (45.98g/106g) x 100
• %Na = (106/45.98g) x 100

Multiple Choice

What is the correct representative particle for potassium?

• Atoms

• Molecules

• Formula Units

Multiple Choice

Avogadro’s number, 6.02 x 10²³, indicates

• the amount of charge on an electron.

• the number of particles in a mole of particles.

• a comparison of the mass of the proton and the electron.

• the weight of 1 atomic mass unit.

Multiple Choice

Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?

• A

• B

• C

• D

Multiple Choice

The number of molecules in a mole of any molecular substance compared to the number of atoms in one mole of any element is

• always larger.

• always less.

• sometimes larger and sometimes smaller

• always the same.

• varies with the substance.

Multiple Choice

How many molecules are present in a 6.0 gram sample of carbon dioxide, CO₂?

Multiple Choice

Which compound has the smallest molar mass?

• SO₂

• NiCl

• PCl₃

• MgBr₂

Multiple Choice

What is the mass of a single molecule of water?

• 3.0 x 10^-23 g

• 1.0 g

• 6.0 x 10^-22 g

• 18.0 g

• 2.9 x 10²³ g

Multiple Choice

Which sample contains the same number of atoms as 24 grams of carbon?

• 80 g. Ar

• 24 g. Mg

• 10 g. Ne

• 4 g. He

• 197 g. Au

Multiple Choice

What is the mass of 2.4 mol of carbon?

• 29g

• 0.20g

• 5.0g

• 6.02 x 10²³g

Multiple Choice

Find the molar mass of $$NaHCO_3$$   

• 84g

• .8401g

• 84.01g

• 81.04g

Multiple Choice

How many atoms are in 3.56 grams of copper?

• 0.34 atoms

• 1.07 x 10²⁵ atoms

• 3.37 x 10²² atoms

• 3.76 x 10^-23 atoms

Multiple Choice

How many atoms are in 122 grams of  $$NO_2$$  ?

• $$9.32\ x\ 10^{-21}$$  atoms

• 15.96 atoms

• $$1.60\ x\ 10^{24}$$  atoms

• 932.23 atoms

Multiple Choice

(Hint: write out how you would solve the problem first on paper before choosing an answer.) 

How would you set up the problem if you have a sample of 2.50 g of sodium (Na), how many moles of Na do you have?

• $$2.50g\ Na\ \times\frac{22.99\ mol\ Na}{1\ g\ Na}=$$  

• $$2.50\ g\ Na\ \times\frac{1\ mol\ Na}{22.99\ g\ Na}=$$  

• $$2.50\ g\ Na\ \times\frac{22.99\ g\ Na}{1\ mol\ Na}=$$  

• $$2.50\ g\ Na\ \times\frac{1\ g\ Na\ }{22.99\ mol\ Na}=$$  

Multiple Choice

How would you set up the problem if you want to find the mass, in grams, of 0.55 moles of silicon?

• $$0.55\ mol\ Si\ \times\ \frac{28.09\ g\ Si}{1\ mol\ Si}\ =\$$  

• $$0.55\ mol\ Si\ \times\frac{1\ g\ Si\ }{28.09\ mol\ Si}=$$  

• $$0.55\ mol\ Si\ \times\frac{28.09\ mol\ Si}{1\ g\ Si}=$$  

• $$0.55\ mol\ Si\ \times\frac{1\ mol\ Si}{28.09\ g\ Si}=$$  

Multiple Choice

Which conversion factor would you use to calculate correctly the mass of 2 moles of the element titanium?

Multiple Choice

(0902) What is the molar mass of Ca(NO₃)₂?

• 148.096 g

• 164.086 g

• 102.055 g

• 70.084 g

Multiple Choice

If an atom of Fluorine has an atomic mass of 19 amu, it has a Molar mass of ____

• 19 lbs.
• 19 kg
• How am I supposed to know?
• 19 g/mol

Multiple Choice

Molar Mass of Ag₂O

• 231.7 g/mol

• 56.2 g/mol

• 734.4 g/mol