AP Chemistry 1.1 assessment

How many molecules of water are there in a 36.0 g sample of water?

• 1.20 x 10^24

• 2.00 x 10^23

• 3.01 x 10^23

• 6.02 x 10^23

How many ATOMS are present in a 36 g sample of water?

• 1.2 x 10^24

• 2.4 x 10^24

• 3.6 x 10^24

• 4.8 x 10^24

If 0.273 moles of an unknown gas has a mass of 12g, find the molar mass of this substance.

• 44 g/mol

• 32 g/mol

• 22 g/mol

• 12 g/mol

What is the mass of one molecule of a substance that has a molar mass of 44 g/mol?

• 7.31 E -23 g

• 3.31 E -23 g

• 44 g

• 1.4 E -22 g

If 1.23 moles of an unknown salt has a mass of 91.7g, find the formula mass of this substance.

• 74.6 g/mol

• 91.7 g/mol

• 111.5 g/mol

• 123.4 g/mol

What is the mass of one formula unit of the substance with a formula mass of 74.47 g/mol?

• 2.438 E -22 g

• 1.238 E -22 g

• 74.47 g

• 74.47 E 23 g