Mole Calculations Review

How many molecules are in one mole of NaCl?

• 1

• 2

• 6.02x10²³

• 3.01x10²³

Tags

NGSS.HS-PS1-7

What is the mass, in grams, of one mole of bromine atoms?

• 6.02x10²³

• 80

• 35

• 7

Tags

NGSS.HS-PS1-1

What is the molar mass of Ca₃(PO₄)₂?

• 43 g/mol

• 87 g/mol

• 279 g/mol

• 310 g/mol

What is the mass of 2.5 moles of NaCl?

• 145 g

• 23.2 g

• 70 g

• 11.2 g

Tags

NGSS.HS-PS1-7

Convert 2.107x10²⁴ molecules of NaCl to moles.

• 1.27x10⁴⁸ moles

• 3.5 moles

• 3.63x10²² moles

• 0.35 moles

What is the percent by mass of lithium in Li₂S?

• 21.9%

• 15.2%

• 69.6%

• 30.4%

A compound has an empirical formula of CH₃. If the molecular mass of this compound is 60 g/mol what is its molecular formula?

• C₂H₆

• C₃H₉

• C₄H₁₂

• C₅H₁₅

According to the reaction shown above, if 6 moles of sodium reacts with excess oxygen how many moles of sodium oxide will be produced?

• 2 moles

• 3 moles

• 6 moles

• 12 moles