Quantitative Chemistry

What is the relative formula mass of CO₂?

• 44
• 32
• 16
• 56

What is the unit for molar mass?

• no unit
• g
• g mol^-1

Tags

NGSS.HS-PS1-7

What is the formula for iron(III) oxide?

• FeO
• Fe₃O
• Fe₃O₂
• Fe₂O₃

Calculate the number of gold atoms in a 4 mole sample of gold.

• 2.41x10²⁴
• 3.01x10²³
• 4.82x10²⁴
• 6.02x10²³

Tags

NGSS.HS-PS1-7

Calculate the number of moles of Aluminum in a 2.04 mole sample of aluminum oxide, Al₂O₃.

• 2.04 moles
• 4.08 moles
• 6.12 moles
• 1.02 moles

Tags

NGSS.HS-PS1-7

Calculate the mass of oxygen present in a 55g sample of Aluminum oxide, Al₂O₃.

• 29.28
• 19.95
• 11.36
• 32.33

Tags

NGSS.HS-PS1-7

Calculate the % composition by mass of oxygen present in H₂SO₄.

• 16.3%
• 65.25%
• 32.6%
• 57.14%

What is the empirical formula of a compound if the molecular formula is W₁₈O₉?

• W₁₈O₉
• W₂O
• W₆O₃
• none of the above

Which represents the greatest mass of sulfur?

• 1 gram of sulfur
• 1 molecule of sulfur
• 0.5 mole of sulfur
• 6.02 x 10²³ atoms of sulfur

What is the mass of one mole of aluminum?

• 27 g
• 13 g
• 54 g
• 14 g