Dual Chem Moles warm up

How many moles are in 4.5x10²⁴ particles?

• 0.747 particles
• 0.747 mol
• 2.71x10⁴⁷ mol
• 2.71x10⁴⁷ particles

How many moles of carbon atoms are there in 5g of carbon?

• 60 mol
• 17 mol
• 0.42 mol
• 7 mol

How many molecules are there in 5.9 moles of NaCl?

• 3.5x10²⁴molecules
• 9.79x10^-24molecules
• 1.02x10²³molecules

How many molecules are present in 69.0 moles of SrO?

• 4.16x10²⁵molecules
• 8.72x10²¹molecules
• 7,149.78 molecules
• 6,893.32 molecules

What is the percent by mass of oxygen in MgO?

• 20%
• 40%
• 50%
• 60%

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.

• SO
• SO2
• SO3
• SO4

What is the molecular formula if the empirical formula is CH₂O and the molecular molar mass is 180.18?

• CH₂O
• C₂H₄O₂
• C₄H₈O₄
• C₆H₁₂O₆

What is the molecular formula for a compound with the empirical formula: K₂SO₄ and a molecular mass of 696g.

• K₂SO₄ 
• K₈SO₁₆
• K₈S₄O₈ 
• K₈S₄O₁₆