Y10 LC1 CHEM HWK 4 - Moles, mass, Mr

What is the relative molar mass (Mr) of NaOH?

• 368 g/mole

• 40 g/mole

• 57 g/mole

• 23 g/mole

36.0 g of Be contains how many moles?

• 0.25 mol
• 4.0 mol
• 45 mol
• 320 mol

What is the mass of one mole of (NH₄)₂CO₃?

• 144g
• 138g
• 96g
• 74g

4.0 moles of H₂O would have what mass?

• 72 g
• 23 g
• 68 g
• 4.5 g

Tags

NGSS.HS-PS1-7

How many grams are in 4.5 moles of sodium fluoride, NaF?

• 0.1 g
• 9.3 g
• 100 g
• 189 g

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃?

• 1.26 moles
• 0.8 moles
• 7,673.4 moles
• 150 moles

Tags

NGSS.HS-PS1-7

Which has a greater mass: 1 mole of sodium (Na) or 2 moles of lithium (Li)?

• 1 mole of sodium

• 2 moles of lithium

• neither

• more information is needed.

How many molecules are in 1 mole?

• 1

• 12

• 6.02 x 10²³

• 6.23 x 10⁶

Which of these is NOT equal to the others?

• 1 mole of CO₂

• 44 grams of CO₂

• 6.02 x 10²³ molecules of CO₂

• 58.93 g of CO₂

What is the relative molar mass (Mr) of ethanol CH₂CH₃OH?

• 26

• 36

• 46

• 56