Understanding the Mole Concept

What is Avogadro's number?

• 6.02214076 × 10^23

• 1.602 × 10^24

• 3.14159 × 10^23

• 6.022 × 10^22

Tags

NGSS.HS-PS1-7

How many molecules are in 2 moles of water?

• 1.008 x 10^24

• 3.6888 x 10^24

• 6.022 x 10^23

• 1.2044 x 10^24

Calculate the molar mass of NaCl.

• 56.12 g/mol

• 60.00 g/mol

• 58.44 g/mol

• 54.44 g/mol

If you have 3 moles of CO2, how many grams do you have?

• 99.00 grams

• 132.03 grams

• 44.01 grams

• 66.00 grams

What is the relationship between moles and mass?

• Moles are equal to mass divided by volume.

• Mass is independent of the number of moles.

• Moles are related to mass through the formula: mass = moles × molar mass.

• Moles can be calculated by subtracting mass from molar mass.

How many atoms are in 1 mole of carbon?

• 3.01 x 10^24

• 12.04 x 10^23

• 6.022 x 10^23

• 6.022 x 10^22

Convert 5 grams of H2O to moles.

• 0.277 moles

• 0.1 moles

• 0.5 moles

• 1.0 moles

What is the molar mass of oxygen (O2)?

• 44.01 g/mol

• 28.02 g/mol

• 16.00 g/mol

• 32.00 g/mol

If you have 0.5 moles of a substance, how many molecules do you have?

• 3.011 x 10^23 molecules

• 6.022 x 10^22 molecules

• 2.5 x 10^23 molecules

• 1.204 x 10^24 molecules

Explain how to convert moles to liters at STP.

• Volume (L) = Moles - 22.4 L/mol

• Volume (L) = Moles × 22.4 L/mol

• Volume (L) = Moles + 22.4 L/mol

• Volume (L) = Moles ÷ 22.4 L/mol