Molar Conversions, Empirical Formula, & Molecular Formula Quiz

How many molecules are in 2.5 mol of Sodium Chloride?

• 1.505x10²³

• 146

• 4.15

• 1.5x10²⁴

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

• 0.0500 moles

• 1.81 x 10⁴⁶ moles

• 5.00 x 10²¹ moles

• 500 moles

What is the mass in grams of 0.89 mol of Calcium Chloride?

• 111 grams

• 0.008 grams

• 99 grams

• none of the choices

A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?

• Mg₄N₃
• MgN₂
• Mg₃N₂ 
• MgN

Molecular Formula = C₂F₆

Choose the correct empirical formula.

• CF

• C₂F₆

• C₃F

• CF₃

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

Empirical Formula = CF₂

Molecular formula mass = 192 g/mol

Molecular Formula = ?

• C₄F₈

• C₈F₄

• C₃F₆

• C₂F₄

What is the empirical formula of K₂SO₄?

• K₂SO₄

• KSO₂

• K₂SO₂

• KSO₈

What is the best definition for subscript?
 

• The big number that tells you the number of molecules.

• The atomic number

• The little number that tells the number of atoms for each element.

A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________

• ionic formula
• covalent formula
• empirical formula
• molecular formula