PAP Moles Calculations and % Composition

What is the molar mass of calcium hydroxide, Ca(OH)₂?

• 74.09 g/mole

• 57.10 g/mole

• 58.09 g/mole

• 57.10 amu

How many molecules are there in 31.8 moles of water?

• 572 g

• 1.91 x 10²⁵ molecules

• 5.28x 10-²⁵ molecules

• 1.77 g

What is the mass of 0.75 moles of ammonium phosphate?

• 0.0044 g

• 91.45 g

• 111.84 g

• 84.73 g

Calculate the % composition by mass of oxygen present in H₂SO₄.

• 16.3%
• 65.25%
• 32.6%
• 57.14%

Calculate the number of moles of chlorine atoms in 55g of copper (II) chloride.

• 0.41 moles

• 0.82 moles

• 1.6 moles

• .20 moles

Tags

NGSS.HS-PS1-7

Calculate the mass of iron in a sample of iron ore containing 2.61x10²³ iron atoms.

• 0.433g
• 24.2g
• 44g
• 6.02g

Tags

NGSS.HS-PS1-7

The best definition for a mole provided below is

• The SI unit for the mass of something
• The SI unit for the amount of a substance
• The SI unit for the volume a substance

• The SI unit for the area of a substance

Calculate the number of moles of Aluminum in a 2.04 mole sample of aluminum oxide, Al₂O₃.

• 2.04 moles
• 4.08 moles
• 6.12 moles
• 1.02 moles

Tags

NGSS.HS-PS1-7

What is the mass of one mole of aluminum chloride?

• 62.435g

• 116.399g

• 133.341g

• 97.888g

How many grams are in 1.20 moles of Neon?

• 0.0519 grams

• 16.6 grams

• 21.2 grams

• 24.2 grams