How many moles are in 9.8 grams of calcium? 

• 0.20 moles
• 4.1 moles
• 1.0 mole
• 392 moles

What is the molar mass of NaOH?

• 368.0 g/mole 
• 40.00 g/mole
• 57.00 g/mole
• 23.00 g/mole

The number 6.02 x 10²³, which is the number of particles found in a mole. 

• molar mass
• mole
• Avogadro's number
• hydrate

Find the percent composition of hydrogen in (NH₄)₂S.

• 11.8%
• 41.1%
• 47.1%

Which conversion factor should be used to solve the following, "Find the mass in grams of 2.00 x 10²³ molecules of F₂."

• 1 mol = 22.4 L 
• 1 mol = 38.00 g
• 1 mol = 6.02x10²³ atoms
• more than one

Tags

NGSS.HS-PS1-7

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.

• NaPO₂
• Na₂PO₃
• Na₃PO₄
• NaPO₄

What is the empirical formula if you have 88.80% copper and 11.20% oxygen?

• Cu₃O₈
• CuO₄
• Cu₂O
• Cu₄O₁₀

What is the molecular formula if the empirical formula is C₂H₅ and the molecular molar mass is 58.14 g/mol?

• C₂H₅
• C₄H₁₀
• C₁H_2.5
• C₄H₈

Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?

• C₂H₃O₂
• CH₂O
• C₂H₄O₂
• C₃H₈O₃