Molar Masses

Question 1

Use the periodic table to determine how many atoms of phosphorus (P) are in a sample that has a mass of 172.90 g.

Revolt · Accepted Answer

3.36 × 1024 atoms

Question 2

8.32 × 1020 formula units CaBr20.276 g199.88 g145,000 g

Revolt · Accepted Answer

0.276 g

Question 3

1.93 × 1026 molecules XeF678,600 g0.77 g245.29 g

Revolt · Accepted Answer

78,600 g

Question 4

Question 4

Revolt · Accepted Answer

0.276 g; 78,600 g

Question 5

Select the correct mass for each of the samples described below.3.01 × 1023 molecules H2O9.01 g18.02 g36.00 g

Revolt · Accepted Answer

9.01 g; 0.276 g; 78,600 g

Question 6

A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder?

Revolt · Accepted Answer

6.02 × 1023 molecules

Question 7

Question 7

Revolt · Accepted Answer

39.10; 190.23; 54.94

Question 8

Potassium (K): g/mol

Revolt · Accepted Answer

"39.10"; "190.23"; "54.94"; 39.10

Question 9

Ammonia (NH3): 17.0418.8118.04 g/mol

Revolt · Accepted Answer

17.04; "17.04"; "58.32"; "159.70"

Question 10

Osmium (Os): g/mol

Revolt · Accepted Answer

190.23

Molar Masses Answers