Chemical Quantities and Moles

What is the SI unit for a count of atoms?

• meter

• mass

• molecule

• mole

What is the formula mass of CO₂?

• 44 grams

• 44 amu

• 0.44 grams

• 2.6 x 10²⁵ atoms

How many atoms of are contained in a mole of sodium?

• 6.02 x 10²³ atoms

• 11 atoms

• 23 atoms

• 2 atoms

Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)

• 1,2,2,2

• 1,2,1,1

• 2,1,1,1

• 2,1,2,1

STP represents Standard Temperature and Particles.

• True

• False

The name of 22.4 is Avogadro's Number.

• False

• True

One mole of hydroxide ions is equal to

• 2.02 grams

• 22.04 L

• 6.02 x 10²³

• 2 to 1

Tags

NGSS.HS-PS1-7

The unit for mass is

• atoms

• molecules

• liters

• grams

Tags

NGSS.HS-PS1-7

The unit for volume is

• liters

• grams

• molecules

• atoms

The volume of a water at STP is

• 18.02

• 6.02 x 10²³

• 22.4

• 18.00

Tags

NGSS.HS-ESS2-5