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Calculating Molecules from Moles

Calculating Molecules from Moles

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Practice Problem

Hard

Created by

Amelia Wright

FREE Resource

The video tutorial explains how to calculate the number of molecules in 37.8 moles of O2. It begins by setting up the problem and clarifying that the type of gas (O2) is irrelevant for the calculation. The tutorial then explains the concept of moles and Avogadro's number, which is used to convert moles to molecules. The calculation is set up by placing moles on the bottom and molecules on the top, allowing for the cancellation of units. The instructor performs the calculation, rounds the result, and provides the final answer, emphasizing the importance of reporting data in a preferred format.

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10 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main objective of the problem discussed in the video?

To determine the volume of O2 gas

To convert moles of O2 to liters

To calculate the number of molecules in 37.8 moles of O2

To find the mass of O2 in grams

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why does the specific substance (O2) not affect the calculation?

Because O2 is a diatomic molecule

Because Avogadro's number is constant for all substances

Because O2 is a gas at room temperature

Because the molar mass of O2 is irrelevant

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is Avogadro's number?

6.02 * 10^22

6.02 * 10^25

6.02 * 10^23

6.02 * 10^24

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the first step in setting up the conversion from moles to molecules?

Place moles on the top and molecules on the bottom

Convert moles to grams first

Use the molar mass of O2

Place molecules on the top and moles on the bottom

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What operation is performed to find the number of molecules in 37.8 moles of O2?

37.8 divided by Avogadro's number

37.8 subtracted from Avogadro's number

37.8 added to Avogadro's number

37.8 multiplied by Avogadro's number

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result of multiplying 37.8 by 6.02?

227.6

227.5

226.5

228.5

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is it better to report the result as 2.28 * 10^25 molecules?

Because it is a more accurate representation

Because it is a smaller number

Because it matches Avogadro's number

Because it is easier to read

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