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Chemistry 2 - Molar Masses Flashcards

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Questions and Answers

Which is the molar mass of H2O?

18.02 g/mol

What is the molar mass of CHCl3?

119.37 g/mol

Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?

Both are made up of 6.02 x 10^23 formula units.

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

132.17 amu Signup and view all the answers

What is the molar mass of a substance?

The mass in grams of one mole of a substance. Signup and view all the answers

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

Each sample has the same number of molecules. Signup and view all the answers

Which value gives the number of particles in 1 mol of a substance?

6.02 x 10^23 Signup and view all the answers

What is the molar mass of Al2(SO4)3?

342.17 g/mol Signup and view all the answers

How are a mole and a dozen similar?

Each names a given number of objects. Signup and view all the answers

Which statement best describes a mole?

It contains 6.02 x 10^23 particles of a given substance. Signup and view all the answers

The mole concept will most likely be used in?

Determining how many ozone molecules are lost in the atmosphere. Signup and view all the answers

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

They both have the same number of atoms. Signup and view all the answers

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

A dozen eggs and a dozen jellybeans. Signup and view all the answers

Which is the molar mass of BF3?

67.81 g/mol Signup and view all the answers

Study Notes

Molar Mass Calculations

Molar mass of water (H2O) is 18.02 g/mol.
Molar mass of chloroform (CHCl3) is 119.37 g/mol.
Molar mass of aluminum sulfate, (NH4)2SO4, is 132.17 amu.
Molar mass of aluminum sulfate, Al2(SO4)3, is 342.17 g/mol.
Molar mass of boron trifluoride (BF3) is 67.81 g/mol.

Mole Concept

A mole contains 6.02 x 10^23 particles, known as Avogadro's number.
One mole of sodium chloride (NaCl) and one mole of aluminum chloride (AlCl3) both consist of 6.02 x 10^23 formula units.
Comparing a mole of magnesium to a mole of iron reveals that both have identical numbers of atoms.

Comparing Substances

The number of molecules in 1 mole of oxygen (O2) is equal to the number of molecules in 1 mole of nitrogen (N2).
A mole and a dozen share the similarity of each denoting a specific count of objects, such as eggs or jellybeans.

Application of Mole Concept

The mole concept is useful for quantifying atmospheric ozone molecule loss.

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Description

Test your knowledge of molar masses with these flashcards! Each card presents a question regarding the molar mass of different compounds or comparisons between them. Perfect for Chemistry 2 students preparing for exams.