Percent Composition and Molecular Formula

Question 1

Use the periodic table to find the molar mass of each of the following elements. Type your answer using two decimal places.Sodium (Na): g/mol

Revolt · Accepted Answer

22.99; Oxygen (O):: 16.00; Carbon (C):: 12.01

Question 2

Oxygen (O): ⇒ 16.00 g/mol

Revolt · Accepted Answer

16.00

Question 3

Carbon (C): ⇒ 12.01 g/mol

Revolt · Accepted Answer

12.01

Question 4

If a sample contains 21.2 g N, how many moles of N does it contain?

Revolt · Accepted Answer

1.51 mol

Question 5

Calculate the molar mass of sodium oxide (Na2O) using the periodic table. Type in your answer using two decimal places. g/mol

Revolt · Accepted Answer

61.98

Question 6

Consider the compound calcium nitrate, Ca(NO3)2. Which statements are true about this compound? Check all that apply.

Revolt · Accepted Answer

There are six atoms of oxygen.; There are two nitrogen atoms.

Question 7

Calculate the molar mass of calcium nitrate using the periodic table. Type in your answer using two decimal places. g/mol

Revolt · Accepted Answer

164.10

Percent Composition and Molecular Formula Answers