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Moles, Percent Comp, Formulas Review

Moles, Percent Comp, Formulas Review

Assessment

Flashcard

Chemistry

10th Grade

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

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15 questions

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1.

FLASHCARD QUESTION

Front

What is the molar mass of H₂O?

Back

18 g/mol (calculated as 2*1 + 16 = 18)

2.

FLASHCARD QUESTION

Front

Define a mole in chemistry.

Back

A mole is a large number (6.022 x 10²³) used to count particles, such as atoms or molecules.

3.

FLASHCARD QUESTION

Front

What information can be obtained from a balanced chemical equation?

Back

The mole ratio of any two substances in the reaction.

4.

FLASHCARD QUESTION

Front

Calculate the percent by mass of chlorine in NaCl (Na = 23 g/mol, Cl = 35.5 g/mol).

Back

61% (calculated as (35.5 / (23 + 35.5)) * 100)

5.

FLASHCARD QUESTION

Front

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon? (C = 12 g/mol, O = 16 g/mol)

Back

43% (calculated as (12 / (12 + 16)) * 100)

6.

FLASHCARD QUESTION

Front

What is the formula to calculate percent composition by mass?

Back

Percent composition = (mass of element / total mass of compound) * 100

7.

FLASHCARD QUESTION

Front

How do you find the empirical formula from percent composition?

Back

Convert percent to grams, divide by molar mass to find moles, and simplify the ratio.

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