Test : The Mole

What is the SI unit for amount of a substance?

• Atomic mass

• Molar mass

• The mole

Where do you find the molar mass of an element?

• The solubility rules

• The periodic table

• The polyatomic ion list

• The activity series

What is Avogadro's number?

• 6.02 x 10²³

• 1 mole

• 600 million

• 6.02

What is the molar mass of H₂O?

• 6.02 x 10²³
• 16.02 g/mole

• 18.02 g/mole

• 15.99999 g/mole

How many atoms are in 1 mole of Iodine (I)?

• 6.022 x 10²³

• 4.022 x 10²³

• 6.022 x 10²⁵

• 4.022 x 10²⁵

What is the empirical formula for C₄H₆

• CH

• C₂H₃

• CH₃

• C₄H

A molecule has 3 atoms of carbon, 4 atoms of hydrogen, and 3 atoms of oxygen. What is the molecular formula?

• CHO

• C₃H₄O₃

• CH₂O

If the percent composition of your compound is 15% Na and 80% Cl, what percentage would O be?

• 0

• 5

• 15

• 1

What is the empirical formula if you have 36.84% nitrogen and 63.16% oxygen?

• NO
• N₂O₃
• N₂O₄
• N₂O₅

You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)

• SO
• SO₂
• SO₃
• SO₄