Primary Mole Calculations

Which of the following would have more mass?

• 1 mole of Li

• 1 mole of Si

• 1 mole of Au

• None, all are equal

How many molecules are there in 31.8 moles of water? (H₂O has a molar mass of 18.0 g/mol)

• 572 g

• 5.28x 10-²⁵ molecules

• 1.91 x 10²⁵ molecules

• 1.77 g

What is the mass of 0.75 moles of (NH₄)₃PO₄?

• 30.1 moles

• 110 g

• 91 g

• 74 g

Which has more molecules?

• 1 mole H₂O

• There are all the same

• 1 mole Al(OH)₃

• 1 mole NaCl

How many molecules are present in 135 g of Teflon C₂F₄

• 6.13 x 10²³ molecules

• 5.13 x 10²³ molecules

• 9.13 x 10²³ molecules

• 8.13 x 10 ²³ molecules

Which of the following would have smaller mass?

• 1 mole of Li

• 1 mole of Cs

• 1 mole of Cu

• 1 mole of O2