Which of the following has more molecules a mole of CO₂ or a mole of H₂O?

• CO₂ has more
• H₂O has more
• They have the same
• Impossible to compare

Tags

NGSS.MS-PS1-1

Which of the following does NOT describe a mole?

• 6.02x10²³
• Abbreviation for molecule
• The number of atoms present in 12 g of carbon-12
• Avogadro's Number

What is the mass of one mole of aluminum chloride?

• 62.43g
• 116.40g
• 133.33g
• 97.89g

How many grams are in 3.62 mol of dicarbon tetroxide?

• 88.0 g
• 3.62 g
• 319 g
• 159 g

Tags

NGSS.HS-PS1-7

What is the percent composition of a compound that contains 40.8 g carbon and 54.4 g oxygen?

• 42.9 % carbon; 57.1% oxygen
• 57.1 % carbon; 42.9 % oxygen
• 40.8 % carbon; 54.4 % oxygen
• 54.4 % carbon; 40.8% oxygen

Tags

NGSS.HS-PS1-7

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

• 27.74% Mg
• 23.57% Mg
• 48.68% Mg
• 13.45% Mg

A sample of water contains 2.10x10²⁵ water molecules.  How many grams of water are present?

• 78.5 g
• 157 g
• 314 g
• 629 g

Tags

NGSS.HS-PS1-7

How many atoms of carbon are in 6.00 g of carbon?

• 1.20x10²⁴atoms C
• 6.02x10²³atoms C
• 3.01x10²³atoms C
• 1.50x10²³atoms C

A container with a volume of 893 L contains how many moles of air at STP?

• 20003.2 L
• 39.9 L
• 22.4 L
• none of the choices

All of the following are empirical formulas EXCEPT

• C₃H₈
• Na₂SO₄
• N₂O₄
• Al₃(SO₄)₂