The Mole Unit Recap

What is Avogadro's Number?

• 6.02 x 10²³

• 6.11 x 10³

• 600

• 6.0

How many molecules are in 2.5 mol of NaCl?

• 1.51x10²⁴

• 146

• 4.15

• 1.50 x 10²³

Which of the following dimensional analysis setups will correctly convert 4.00x10²³atoms of cobalt to moles of cobalt? How many moles of colbalt are there?

• setup B : 0.6644mol Co
• setup A: 2.41x10⁴⁷mol Co
• setup A : 0.664mol Co
• setup B: 2.41x10⁴⁷mol Co

Determine the molar mass for carbon tetrachoride, CCl₄.

• 153.823 g/mol

• 118.37 g/mol

• 189.35 g/mol

• 47.464 g/mol

How many grams are in 3.3 mol of potassium sulfide, K₂S?

• 363.86 g

• 364.00 g

• 110.26 g

• 1.99x10²⁴ g

How many grams are in 1 mole of Carbon?

• 14.50 g

• 6 g

• 12.01 g

• 36.03 g

How many moles are in 3.01 x 10²² atoms of magnesium?

• 0.050 moles
• 1.81 x 10⁴⁶ moles
• 5.00 x 10²¹ moles
• 5.00 moles

Tags

NGSS.HS-PS1-7

Which of the following dimensional analysis setups will correctly convert 27.76g of Li to atoms of Li?

• A
• B
• C
• D

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

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

Tags

NGSS.HS-PS1-7

What is the percent composition by mass of sulfur in the compound MgSO₄ (molar mass = 120 g/mol)?

• 20%

• 27%

• 46%

• 53%