Mole Concept Practice

How many molecules are in 2.00 moles of H₂O?

• 124x10²⁴ molecules of H₂O

• 1.20x10²³ molecules of H₂O

• 1.20x10²⁴ molecules H₂O

• 124

How many atoms are in 1.50 moles of Hg?

• 9.03x10²³ atoms Hg

• 9.03x10²⁴ atoms Hg

• 903 atoms of Hg

• 9.03 atoms of Hg

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.0500 moles

• 1.81 x 10⁴⁶ moles

• 5.00 x 10²¹ moles

• 5.00 moles

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃? (Ar Al=27, H=1, O=16)

• 1.26 moles

• 0.8 moles

• 7,673.4 moles

• 150 moles

Mass of 4 moles of Al atom is

• 108 u

• 108 g

• both A and B

• 108

Tags

NGSS.HS-PS1-7

A mole of potassium chloride contains 6.02 x 10²³ _____

• atoms

• formula units

• ions

• molecules

What is the mass of 2.50 mol of oxygen gas O₂?

• 40 g

• 80 g

• 16 g

• 32 g

How many Mg atoms are present in 3.00 moles of MgCl2 ?

• 1.81 x 10^24

• 3.02 x 10^24

• 12.0 x 10^25

• 16.0 x 10^23

Tags

NGSS.HS-PS1-7

How many atoms of carbon are in 6.00 g of carbon?

• 1.20x10²⁴ atoms C

• 6.02x10²³ atoms C

• 3.01x10²³ atoms C

• 1.50x10²³ atoms C

How many grams are in 1.2 x 10²⁴ molecules of CO? (molar mass of CO = 28 g/mol)

• 28.2 g

• 55.8 g

• 6.02 g

• 1.2 g

Tags

NGSS.HS-PS1-7