Percent Composition Review

Percent Composition Review

Assessment

Flashcard

Chemistry

10th - 12th Grade

Hard

Created by

Wayground Content

FREE Resource

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15 questions

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1.

FLASHCARD QUESTION

Front

What is percent composition?

Back

Percent composition is the percentage by mass of each element in a compound, calculated by dividing the mass of the element by the total mass of the compound and multiplying by 100.

2.

FLASHCARD QUESTION

Front

How do you calculate the percent composition of an element in a compound?

Back

To calculate percent composition, use the formula: (mass of element in 1 mole of compound / molar mass of compound) x 100.

3.

FLASHCARD QUESTION

Front

What is the percent by mass of oxygen in MgO?

Back

40%.

4.

FLASHCARD QUESTION

Front

What is the percent composition by mass of magnesium in MgSO4?

Back

20%.

5.

FLASHCARD QUESTION

Front

What is the percent composition by mass of sulfur in MgSO4?

Back

27%.

6.

FLASHCARD QUESTION

Front

What is the formula for calculating the molar mass of a compound?

Back

The molar mass of a compound is calculated by summing the atomic masses of all the atoms in the formula.

7.

FLASHCARD QUESTION

Front

What is the percent composition of oxygen in magnesium chlorate?

Back

50.21%.

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