moles

Which of the following have the same empirical formula? (Check all that apply)

• C₆H₁₂O₆

• C₄H₈O₄

• C₃H₉O₃

• C₄H₁₀O₂

What is the molar mass of Mg(OH)₂

• 41 g/mol

• 58 g/mol

• 73 g/mol

• 98 g/mo

What is the mass of one mole of Al₂(SO₄)₃?

• 75.04 g
• 342.14 g 
• 75.04 mol
• 342.14 mol

How many moles are present in 32.3 grams of CO₂? (Hint: the molar mass of CO₂ is 44.01 g/mol)

• 44.01 moles

• 1421.52 moles

• 32.3 moles

• 0.73 moles

Find the percentage composition of P in Mg₃(PO₄)₂.

• 27.74% P

• 23.57% P

• 43.62% P

• 12.63% P

How many atoms of Ca make up 5.17 moles of Ca?

• 3.1 x 10²⁴ atoms

• 6.02 x 10²⁴ atoms

• 1.2 x 10²⁴ atoms

• 2.4 x 10²⁴ atoms

the mass of one mole of a substance

• mole

• molar mass

• mole ratio

• percent composition

How many molecules of Copper Oxide are in 2.4 moles of Copper Oxide?

• 2,000

• 1.4 x 10²¹

• 2.0 x 10²⁰

• 1.4 x 10²⁴

How many moles are 4 grams of Nitrogen?

• 4 moles

• 0.14 moles

• 0.285 moles

• 1.4 moles