Moles and Formula Mass

How many atoms of oxygen are in the formula?

• 2

• 1

• 3

• 4

• 12

Tags

NGSS.MS-PS1-1

What is the formula mass of the pictured formula?

• 192

• 400

• 96

• 112

What is the percent of Iron in the formula mass?

• 27.9

• 48.01

• 24.05

What is the percent of Oxygen in the formula mass?

• 27.9

• 48.01

• 24.05

What is the mass of one mole of aluminum Fluoride (remember to determine the correct formula first)?

• 46g

• 65g

• 84g

• 111g

Find the percentage composition of  Mg in Mg₃(PO₄)₂.
   

• 27.75% Mg
• 23.57% Mg
• 48.68% Mg
• 13.45% Mg

Find the percent composition of each element in N₂S₂ .

• 69.6% N, 30.4%S
• 15.2% N, 84.8% S
• 30.4% N, 69.6% S
• 65.2% N, 34.8% S

What is Avogadro's number?

• 6.02 x 10²³

• 1 mole

• 600 million

• 6.02

Tags

NGSS.HS-PS1-7

How many moles are in 6.02 x 10²³ molecules of H₂O?

• 1 mole

• 2 moles

• 6.02 moles

• 602000000000000000000000 moles

How many moles are in 8.30 X 10²³ molecules of H₂O?

• 1.38 X 10²³ moles H₂O

• 1.38 moles H₂O

• 2 moles H₂O

• 1 mole H₂O