% Composition of compound

% Composition of compound

Professional Development

15 Qs

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% Composition of compound

% Composition of compound

Assessment

Quiz

Chemistry

Professional Development

Hard

Created by

Flora Valdez

Used 2+ times

FREE Resource

15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

 

What is the general formula for the computation of percentage composition of the given element?

a. % mass of element = mass of element in the compound divided by mass of the compound times 100

b. % mass of element = mass of element in the compound divided by mass of the compound

c. % mass of element = mass of element in the compound divided by 100

d. % mass of element = mass of element in the compound

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent by mass of magnesium in MgO?

a. 20%

b. 40%

c. 50%

d. 60%

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent by mass of chlorine in NaCl?

a. 39%

b. 61%

c. 35%

d. 36%

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?

a. 24%

b. 48%

c. 49%

d. 65%

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent by mass of calcium in CaF2 (gram-formula mass = 78 g/mol)?

a. 24%

b. 49%

c. 51%

d. 65%

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the percent composition of Benzene, C6H6?

a. C = 50%

H = 50%

b. C = 85.7 %

H = 14.3%

c. C = 92.2%

H = 7.8%

d. C = 71.9%

H = 28.1%

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?

a. K

b. C

c. N

d. None

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