The mole

The mole

Assessment

Flashcard

Chemistry

11th - 12th Grade

Practice Problem

Hard

Created by

Wayground Content

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14 questions

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1.

FLASHCARD QUESTION

Front

What is the mole?

Back

The mole is a unit of measurement used in chemistry to express amounts of a chemical substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

2.

FLASHCARD QUESTION

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule.

3.

FLASHCARD QUESTION

Front

How do you calculate the molar mass of NaCl?

Back

To calculate the molar mass of NaCl, add the atomic mass of sodium (Na, 22.990 g/mol) and chlorine (Cl, 35.453 g/mol). Molar mass of NaCl = 22.990 + 35.453 = 58.443 g/mol.

4.

FLASHCARD QUESTION

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.022 x 10^23) is the number of atoms, molecules, or particles in one mole of a substance. It allows chemists to convert between moles and number of particles.

5.

FLASHCARD QUESTION

Front

What volume does one mole of gas occupy at STP?

Back

At standard temperature and pressure (STP), one mole of an ideal gas occupies 22.4 liters.

6.

FLASHCARD QUESTION

Front

How do you find the number of moles from grams?

Back

To find the number of moles from grams, use the formula: Moles = Mass (g) / Molar Mass (g/mol).

7.

FLASHCARD QUESTION

Front

What is the molar mass of H2O?

Back

The molar mass of water (H2O) is calculated by adding the molar masses of 2 hydrogen atoms (2 x 1.008 g/mol) and 1 oxygen atom (16.00 g/mol). Molar mass of H2O = 2.016 + 16.00 = 18.016 g/mol.

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