Molar Masses

Question 1

In a classroom, which comparison would a teacher most likely use for describing a mole?

Revolt · Accepted Answer

a dozen eggs and a dozen jellybeans

Question 2

How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?

Revolt · Accepted Answer

Each sample has the same number of molecules.

Question 3

How are a mole and a dozen similar?

Revolt · Accepted Answer

Each names a given number of objects.

Question 4

Which is the molar mass of BF3?

Revolt · Accepted Answer

67.81 g/mol

Question 5

Which is the molar mass of H2O?

Revolt · Accepted Answer

18.02 g/mol

Question 6

What is the molar mass of CHCl3?

Revolt · Accepted Answer

119.37 g/mol

Question 7

Consider the equation below.Na+ + Cl– NaClWhich statement best describes the relationship between the substances in the equation?

Revolt · Accepted Answer

The number of sodium ions is equal to the number of formula units of salt.

Question 8

Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?

Revolt · Accepted Answer

They both have the same number of atoms.

Question 9

What is the molar mass of a substance?

Revolt · Accepted Answer

the mass in grams of one mole of a substance

Question 10

Which is the formula mass of (NH4)2SO4?

Revolt · Accepted Answer

132.17 amu

Molar Masses Answers