Chapter 7.3 & 7.4

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

What is the mass of one mole of aluminum?

• 26.98 g

• 13 g

• 53.96 g

• 14 g

What is the molar mass of (NH₄)₂O?

• 34 g/mol
• 33 g/mol
• 49 g/mol
• 50 g/mol

What is the molar mass of Ca(OH)₂

• 40 g/mol
• 64 g/mol
• 57 g/mol
• 63 g/mol

Find the number of moles in 25 grams of HF?

• 1.25 mol HF
• 25 mol HF
• 0.8 mol HF
• 80 mol HF

Tags

NGSS.HS-PS1-7

How many grams is 1.2 moles of Neon?

• 0.05 grams
• 16.6 grams
• 21.2 grams
• 24 grams

How many moles are in 564 grams of Copper?

• 0.11 mol Cu
• 25 mol  CU
• 87 mol Copper
• 8.87mol Cu

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.

Which one is empirical?

• H₂O₂
• C₂H₆O₁₂
• CaCl₂
• N₂O₈

What is the % composition of H in heptane, C₇H₁₆? 

• 7 %
• 84 %
• 70%
• 16%