.3b Moles Review 2024

Which pair has the same empirical formula?

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

What is the empirical formula of the following molecular formula:  C₃H₆

• C₃H₆
• CH₂
• C₂H₄
• CH₃

Which one is empirical?

• H₂O₂
• C₂H₆O₁₂
• CaCl₂
• N₂O₈

What is the empirical formula for the following molecular formula: C₆H₁₄

• C₆H₁₄
• C₃H₇
• CH₂
• CH₃

An empirical formula:

• is a formula that calculates the coefficients of a compound in a balanced equation.
• is the simplest whole-number ratio of moles of elements in the compound.

T/F
A compounds molecular formula can be the same as its empirical formula

• True
• False

What is the molar mass of dihydrogen dioxide?

• 48 g/mole
• 34.02 g/mole
• 36.5 g/mole
• 35.5 g/mole

How would you solve the following problem: "How many moles in 28 grams of CO₂?"

• multiply by 22.4 L

• divide by 44.01 g

• multiply by 6.02x10²³ atoms

• multiply by 44.01 g

How many grams are in 3.3 mol of Potassium Sulfide?

• 360 g
• 454 g
• 238 g
• 132 g

How many Carbon atoms are in one mole of Carbon?

• 6.02 x 10²³
• 1
• 12
• not enough information