Unit 9: The Mole

How many moles of silver are in 1.8 x 10²⁰ atoms of silver?

• 3.0 x 10^-4

• 3.3 x 10^-3

• 3.0 x 10⁴

• 1.1 x 10^-44

How many molecules are in 2.10 moles of CO₂?

• 2.53 x 10²⁴

• 3.79 x 10²⁴

• 3.49 x 10^-24

• 1.26 x 10²⁴

What is the molar mass of (NH₄)₂CO₃?

• 144g

• 138g

• 96g

• 78g

What is the mass in grams of 5.90 mol C₈H₁₈?

• 0.0512g

• 19.4g

• 389g

• 673g

What is the percent composition of barium in BaCrO₄?

• 20.5%

• 54.2%

• 25.26%

• 66.88%

If 60.2 grams of Mg combine with 24.0 g of Cl to form a compound, what is the percent composition of Mg?

• 28.50%

• 41.37%

• 60.33%

• 71.50%

How many moles are in 5.0 L of Ar gas (at STP)?

• 112 mol

• 8.92 mol

• 0.223 mol

• 2.80 mol

Avogadro's number is______?

• 6.02 x 10²³

• 6.02 x 10^-23

• 2.06 x 10²³

• 6.02 x 10⁴³

Tags

NGSS.HS-PS1-7

Avogadro's number of representative particles is equal to one_______?

• mole

• gram

• liter

• kilogram

How many molecules are in 28 g of CO₂?

• 7.42 x 10²⁶

• 3.5 x 10^-21

• 3.8 x 10⁴⁴

• 3.83 x 10²³