Unit 6-Review The Mole

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 molecules are there in 5.9 moles of NaCl?

• 3.6x10²⁴molecules

• 9.79x10^-24molecules

• 1.02x10²³molecules

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%

Tags

NGSS.HS-PS1-7

• 109 g

• 100 g

• 120 g

• 101g

How many moles of oxygen atoms are in 3.011 x 10^23 atoms of oxygen?

To solve this problem you should...

Tags

NGSS.HS-PS1-7

The molar mass of an element is the mass of one ____ of the element.

• atom
• molecule
• mole
• gram

A beaker contains 3.0 moles of copper. How many grams of copper are in the beaker?

Molar mass of Cu : 64 g/mol

• 192 g

• 21.2 g

• 0.047 g

• 86.3 g

Tags

NGSS.HS-PS1-7

At STP, 2.5 moles of helium gas will have what volume?

At STP, molar volume is 22.4 L

• 9 L

• 56 L

• 27 L

• 72 L