Mole Concepts

Convert 0.454 moles of neon (Ne) to liters?

• a. 49.34 L

• b. 101.17 L

• c. 10.17 L

• d. 0.0202 L

Which of the following setups will correctly change 2.50 moles of sodium to grams of sodium?

• a. A

• b. B

• c. C

• d. D

Tags

NGSS.HS-PS1-7

What’s the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen?

• a. Li₂CO₂

• b. Li₂CO₃

• c. Li₂CO

• d. LiCO₃

A compound with an empirical formula of C₄H₄O and a molar mass of 136 grams per mole has which molecular formula?

• a. C₈H₈O2

• b. C₁₂H₁₂O₃

• c. C₁₆H₁₆O₄

• d. CH₄O

How many moles are 98.3 grams of aluminum hydroxide, Al(OH)₃? (Atomic mass of Al = 27, H= 1, O = 16)

• a. 1.26 moles

• b. 0.8 moles

• c. 7,673.4 moles

• d. 150 moles

Tags

NGSS.HS-PS1-7

How many atoms are contained in 25 g of NaBr? (Atomic

• a. 1.45x10²³ molecules

• b. 0.24 molecules

• 102.96 molecules

• d. 2.34 x 10²⁰molecules

Identify the number of Chlorine atoms in 65.8 g CaCl_2.

• a. 7.14 x 10²³ atoms

• b. 8.71 x 10²³ atoms

• c. 1.22 x 10²³ atoms

  Incorrect

• d. 3.57 x 10²³ atoms

How many grams are in 1.2 x 10²⁴ molecules of CO? (molar mass of CO = 28 g/mol)

• 6.02g

• b. 28.2 g

• c. 55.8 g

• d. 1.2 g

Tags

NGSS.HS-PS1-7

How many particles are in a mole?

• 602

• 602 million

• 602 moles

• 6.02 x 10²³

Which would have more atoms?

• mole of Li

• mole of Au

• mole of Si

• None, all are equal