Molar Mass and Compound Composition

Molar Mass and Compound Composition

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Lucas Foster

FREE Resource

This video tutorial explains how to calculate the molar mass of potassium chromate (K2CrO4). It begins by identifying the molar masses of individual elements: potassium, chromium, and oxygen, using the periodic table. The video then demonstrates how to multiply these values by the number of atoms present in the compound and sum them to find the total molar mass of K2CrO4, which is 194.19 grams per mole. The tutorial concludes with a brief explanation of the significance of molar mass in terms of moles and grams.

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6 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in determining the molar mass of a compound?

Identify the elements in the compound

Calculate the volume of the compound

Find the density of the compound

Determine the temperature of the compound

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many potassium atoms are present in K2CrO4?

Three

Two

Four

One

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the atomic mass of chromium used in the calculation?

12.01 grams per mole

16.00 grams per mole

51.99 grams per mole

39.10 grams per mole

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How many oxygen atoms are present in potassium chromate?

Two

Four

Three

Five

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the total molar mass of potassium chromate (K2CrO4)?

150.20 grams per mole

194.19 grams per mole

200.00 grams per mole

180.15 grams per mole

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the molar mass of a compound represent?

The density of one mole of the compound

The mass of one mole of the compound

The number of atoms in one mole of the compound

The volume of one mole of the compound

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