Unit 7 Review

The molar mass of an element is equal to its...

• Atomic mass
• Atomic number
• Oxidation number
• Valence electrons

The mass of one mole of substance is called...

• molecular mass
• mole constant
• molar mass
• atomic weight

Tags

NGSS.MS-PS1-5

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol
• 35.453 g/mol
• 22.990 g/mol
• 58.443 g/mol

What is the molar mass of NaOH?

• 40 g/mol
• 38.989 g/mol
• 23.998 g/mol
• 57.004 g/mol

Determine the mass of 4.20 moles of C₆H₁₂

• 353 g

• 0.0499 g

• 337 g

• 2.53 x 10²⁴ g

What is the mass of one mole of aluminum chloride?

• 62.435g
• 116.399g
• 133.341g
• 97.888g

Find the mass in grams of 2.25 x 10²⁴ atoms of calcium (Ca).

• 40.0 grams

• 255.1 grams

• 150 grams

• 9.02 x 10²⁴ grams

What is the volume of 160 g of oxygen gas at STP?

• 112 L

• 22.4 L

• 78.8 L

• 114.24 L

• 224 L

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent composition of Benzene, C₆H₆?

• C = 50%
  H = 50%
• C = 85.7 %
  H = 14.3%
• C = 92.2%
  H = 7.8%
• C = 71.9%
  H = 28.1%