Unit 6 -The Mole Review

What is the mole used for? 

• To measure the amount of grams in a substance
• To measure the amount of atoms or molecules in a substance
• To measure the amount of energy in a substance
• To measure the amount of bonding in a substance 

Tags

NGSS.HS-PS1-7

How many moles are in 4.5x10²⁴ particles?

• 0.748 particles

• 7.48 mol

• 2.71x10⁴⁷ mol

• 2.71x10⁴⁷ particles

How many formula units (molecules) are there in 5.9 moles of NaCl?

• 3.6x10²⁴

• 9.79x10^-24

• 1.02x10²³

What is the percent by mass of potassium in KCl?

• 52.7%

• 61.3%

• 35.7%

• 65.1%

What is the percent by mass of oxygen in MgO?

• 20%

• 40%

• 50%

• 60%

• 109 g

• 100 g

• 120 g

• 101g

If you have 10 moles of oxygen gas, how many grams do you have?

• 320 grams

• 160 grams

• 1600 grams

• 16 grams

Which of the following elements are diatomic? Choose all the correct answers.

• Hydrogen

• Oxygen

• Nitrogen

• Argon

• Helium

How many diatomic elements are there?

• 7

• 6

• 8

• 5