Chemical Calculations

In chemistry, a "mole" is:

• The mass of an atom
• A unit of measurement to count particles
• based on the volume of a substance
• The number of atoms

The number 6.02 x 10²³ is called...

• Obama's number
• Bohr's number
• Trump's number
• Avogadro's number

Tags

NGSS.HS-PS1-7

The unit for molar mass is

• g/mol
• mol/g
• grams
• moles

Tags

NGSS.HS-PS1-7

What is the M_r of NaOH?

• 23
• 44
• 40
• 18

1 mol = _____ g O₂

• 16
• 32
• 8
• 24

Tags

NGSS.HS-PS1-7

M_r for Na₂CO₃ is

• 100
• 106
• 74
• 90

Tags

NGSS.HS-PS1-7

How many moles are there in 8g of hydrogen molecules?

• 8
• 4
• 16
• 0.25

Tags

NGSS.HS-PS1-7

How many moles are there in 440g of carbon dioxide molecules?

• 11
• 10
• 16
• 0.25

How many moles are there in 8.50 x 10²⁴ molecules of sodium sulfate, Na₂SO₄? (molecules to mole)

• 1.40 moles
• 14.1 moles
• 51.2 moles
• 5.12 x 10⁴⁸ moles

How many molecules are in 2.50 moles of H₂O? (moles to molecules)

• 1.51 x 10²⁴ molecules of H₂O
• 4.15 x 10^-24 molecules of H₂O
• 3.01 x 10²⁴ molecules of H₂O
• 8.31 x 10^-24 molecules of H₂O