Unit 8 Part 2 Notes: Moles to Mass

Multiple Choice

The number 6.02 x 10²³ is called...

• Obama's number
• Bohr's number
• Trump's number
• Avogadro's number

Multiple Choice

Where do you look to calculate the molar mass?

• avogadros number
• periodic table 

Multiple Choice

What is the molar mass of NaOH?

• 368 g/mole 
• 40 g/mole
• 57 g/mole
• 23 g/mole

​H₂O

Multiple Choice

What is the mole ratio of H₂O to H₃PO₄ in the following chemical equation?   P₄O₁₀ + 6 H₂O --> 4 H₃PO₄ 

• 6:4
• 4:6
• 1:3
• 3:1

Multiple Choice

1 CH₄ + 2 O₂ → 1 CO₂ + 2 H₂O

How many moles of carbon dioxide (CO₂) are produced from the combustion of 110.0 g of CH₄ (molar mass = 16 g)?

• 13.7 mol

• 2.75 mol

• 6.85 mol

• 6.11 mol

Multiple Choice

How many grams of magnesium chloride are produced if 4.67 moles of HCl react?

Mg + 2 HCl --> MgCl₂ + H₂

• 222 g MgCl₂

• 4.67 g MgCl₂

• 94 g MgCl₂

Multiple Choice

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂

Multiple Choice

Using the following equation:
4NH₃(g) + 5O₂(g) --> 4NO(g) + 6H₂O(l)
How many grams of oxygen gas are needed to react with 56.8 grams of ammonia?

• 45.08 g O₂
• 133.33 g O₂
• 260.77 g O₂
• 75.92 g O₂