Chemistry Review

The mass of a mole of NaCl is its

• molar mass

• empirical formula

• gram atomic mass

• atomic mass

Which of the following describes percent composition?

• the number of representative particles in a mole of a substance

• the percent by mass of each element in a compound

• an atom, a formula unit, or a molecule

• the volume occupied by a mole of any gas at STP

The molar mass of molecular oxygen (O2) is

• 8.0 g

• 16.0 g

• 32.0 g

• none of the above

The molar mass of a gas can be determine from

• the density of the gas at STP

• the volume of a mole of the gas

• Avogadro's number

• none of the above

What is the volume, in liters at STP, of 2.50 mol of CO (carbon monoxide)?

You are given 300 seconds (5 minutes) to answer this question. Try your best to solve it!

• 0.112 L

• 3.10 L

• 56.0 L

• 8.96 L

If a substance is at 1 atm pressure and 0 degrees C, what must the volume be at STP?

• it's different per element

• 22.4 L

• contain twice Avogadro's number of representative particles

How many moles of SO3 are in 2.4 x 10 ^ 24 representative particles of SO3?

You are given 300 seconds (5 minutes) to answer this question. Try your best to solve it!

• 0.25 moles

• 3.4 x 10 ^ 22 moles

• 3.98 moles

• 2.9 x 10 ^ -23 moles

A compound is formed when 9.03 g Mg combines completely with 3.48 g N. What is the percent composition of this compound? PICK TWO ANSWERS! You have 5 minutes to answer this question. Try your best!

• 72.2% Mg

• 72.2% N

• 27.8% N

• 27.8% Mg

Tags

NGSS.HS-PS1-7

How many atoms are in 10 mol of AlO?

You are given 300 seconds (5 minutes) to answer this question. Try your best to solve it!

• 6.02 x 10^24 atoms

• 1.7 x 10^-23 atoms

• 430 atoms

• 224 atoms

How many liters are in 4.50 mole of H2O at STP?

You are given 300 seconds (5 minutes) to answer this question. Try your best to solve it!

• 450

• 2.71 x 10 ^ 24

• 6.02 x 10 ^ 23

• 100.8