Moles, % Composition, Empirical and Molecular Formula

How many moles are in 4.5x10²⁴ particles?

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

Tags

NGSS.HS-PS1-7

What is the molar mass of Mg₃N₂?

• 191.6 g/mol
• 76.64 g/mol
• 38.32 g/mol
• 100.95 g/mol

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 of carbon atoms are there in 5g of carbon?

• 60 mol
• 17 mol
• 0.42 mol
• 7 mol

How many molecules are present in 69.0 moles of SrO?

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

Tags

NGSS.HS-PS1-7

How many Cl^- ions are found 2.00 mol of potassium chloride (KCl)

• 6.022 x 10²³

• 1.20 x 10²⁴

• 0.48

• 5.73 x 10²³

Tags

NGSS.HS-PS1-7

How many grams of carbon dioxide are in 0.5 mol of carbon dioxide?

• 11 g

• 44.009 g

• 22.005 g

• 88.018 g

Tags

NGSS.HS-PS1-7

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Tags

NGSS.HS-PS1-7

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