Molar Mass and Percent Composition

What are the units for molar mass?

• grams
• moles
• grams/mole
• liters

Tags

NGSS.HS-PS1-7

Fluorine gas is diatomic. What is its molar mass?

• 18.998 g/mol
• 37.996 g/mol
• 9 g/mol
• 18 g/mol

Which compound has the smallest molar mass?

• CO
• CO₂
• H₂O
• H₂O₂

What is the mass of 1.8 mol of aluminum chloride?

• 26.98 g
• 62.43 g
• 133.34 g
• 240.01 g

How many grams are in 3.62 mol of dicarbon tetroxide?

• 88.0
• 3.62
• 319
• 159

How many moles in a tablespoon (~12.5 g) of sugar (C₁₂H₂₂O₁₁)?

• 342.3
• 0.0365
• 27.38
• 8.46

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

The molar mass of an element is equal to its...

• Atomic mass
• Atomic number
• Oxidation number
• Valence electrons

Find the percentage composition of  Mg in Mg₃(PO₄)₂.
   

• 27.75% Mg
• 23.57% Mg
• 48.68% Mg
• 13.45% Mg

The mole concept is important in chemistry because

• it allows us to distinguish between elements and compounds.
• atoms and molecules are very small and the mole concept allows us to count atoms and molecules by weighing macroscopic amounts of material.
• it establishes a standard for reaction stoichiometry.
• it provides a universally accepted standard for mass.

Tags

NGSS.HS-PS1-7