Molar Mass and Mole Fraction Concepts

Molar Mass and Mole Fraction Concepts

Assessment

Interactive Video

Chemistry, Mathematics, Science

9th - 12th Grade

Hard

Created by

Patricia Brown

FREE Resource

The video tutorial covers the concept of fractions using a cake analogy, then transitions to explaining mole fractions in chemistry. It demonstrates how to calculate mole fractions in solutions with examples involving salt, sugar, and water. The tutorial further explores numerical problems, including calculating mole fractions for methanol and water, and a more advanced problem with ethylene glycol. Key concepts include understanding fractions, mole fractions, and their calculations in various chemical solutions.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a fraction represent in the context of a whole?

A part of something out of total parts

The total number of parts

A whole number

A decimal representation

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is mole fraction denoted in chemical calculations?

By the letter M

By the letter X

By the letter F

By the letter N

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a solution with 2 moles of salt, 3 moles of sugar, and 6 moles of water, what is the mole fraction of salt?

2/8

2/10

2/11

2/9

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the mole fraction of sugar in a solution with 3 moles of sugar and a total of 11 moles of solution?

3/10

3/9

3/8

3/11

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do you calculate the number of moles from a given mass and molar mass?

Subtract the molar mass from the given mass

Multiply the given mass by the molar mass

Add the given mass to the molar mass

Divide the given mass by the molar mass

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the molar mass of methanol if its molecular formula is CH3OH?

18 g/mol

44 g/mol

28 g/mol

32 g/mol

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a solution with 40 grams of methanol and 200 grams of water, what is the mole fraction of methanol?

0.101

0.401

0.201

0.301

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