Molar Mass VS Mole Ratio Review

The molar mass of NaOH is (a)   .

Round the answer to the nearest whole number. Include the correct unit.

What is the mass of one mole of aluminum?

• 27 g
• 13 g
• 54 g
• 14 g

What is the molar mass of fluorine gas?

• 38 g/mol
• 9 g/mol
• 19 g/mol

The molar mass of an element is equal to its ___

• Atomic mass
• Atomic number
• Valence electrons

The molar mass of KOH is (a)   g/mol.

"​ (a)   per ​ (b)   " is a unit used to measure the molar mass of a substance.

• grams
• mole
• molecule
• atoms

Mole ratios of two substances are derived from...

• the molar mass of the reactants in the balanced chemical equation

• the coefficients of the balanced chemical equation

• the subscripts of the products in the balanced chemical equation

2 C₂H₆ + 7 O₂ → 4 CO₂ + 6 H₂O

Ethane (C₂H₆) combusts in the above reaction. What is the mole ratio of ethane to oxygen gas?

• 
• 
• 
• 

In the equation 2 Al₂O₃ → 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen?

• 10:6 
• 3:4
• 4:3
• 2:3

N₂ + 3H₂ → 2NH₃

How many moles of N₂ are needed to produce 3.5 moles of NH₃?

(a)