Mole Practice

What is the molar mass of AuCl₃?

• 96 g
• 130 g
• 232.5 g
• 303.3 g

A mole of carbon dioxide contains 6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

Tags

NGSS.HS-PS1-7

How many molecules are there in 31.8 moles of water?

• 5.28 x 10^-23 molecules
• 1.91 x 10²⁵ molecules
• 5.28x 10-²⁵
• 1.91 x 10²²

Determine the number of
atoms in
2.50 moles of zinc.

• 1.51 x 10²⁴ atoms
• 4.15 x 10^-24 atoms
• 2.71 x 10^-22 atoms
• 163 atoms

How many moles of sulfur atoms are there in 5.0 g of sulfur?

• 160 mol
• 8.3 x 10^-24 mol
• 0.16 mol
• 2.7 x 10^-22 mol

Tags

NGSS.HS-PS1-7

How many grams of silicon (atomic mass = 28.1 amu) would there be in a sample that contained 9.99 x 10⁵² atoms? (atoms to grams)

• 1.69 x 10²⁸
• 4.66 x 10³⁰
• 1.66 x 10⁷³
• 1.69 x 10⁷⁸

How many grams of NaCl (molar mass = 58.45g) are present in 11.00 moles? (moles to grams)

• 0.4500 g
• 156.6 g
• 331.0 g
• 642.9 g

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

Tags

NGSS.HS-PS1-7

Find the Molar Mass of:
Ga₂(SO₃)₃

• 280 g/mol
• 400 g/mol
• 380 g/mol
• 480 g/mol