Unit 6 - Moles & Stoichiometry

What is the molar mass of Carbon?

• 6
• 12
• 20
• 40

How many moles is 4 grams of Calcium?

• 0.10 moles
• 10 moles
• 44 moles
• 160 moles

How many particles are in a mole?

• 602
• 602 million
• 602 moles
• 6.02 x 10²³

What is the molar mass of NaCl?

• 18.02 grams 
• 40 grams 
• 58.44 grams 
• 65.33 grams 

What is the equation for calculating percent composition?

• mass of element/mass of compound = x 100

• mass of compound/mass of element = x 100

• total mass/molar mass = x 100

• molar mass/molar mass = x 100

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

Find the percent composition of N₂S₂.

• N: 69.6%  S: 30.4%
• N:36% S: 75.6%
• N: 96.6% S: 3.4%
• N: 30.4% S: 69.6%

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

How many moles of H₂O are produced by 4.8 moles of O₂?
2H₂ +O₂ -----> 2H₂O

• 9.6 mol H₂O
• 317 mol H₂O
• 906 mol H₂O
• 3.7 mol H₂O

Tags

NGSS.HS-PS1-7

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂ 
What is the total number of moles of water needed to make 2.5 moles of C₆H₁₂O₆?

• 2.5
• 6
• 12
• 15

Tags

NGSS.HS-PS1-7