# Online Assignment 1.1: The Mole Concept And Avogadro's Constant

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This assignment consists of 5 questions.
Each questions offers 4 suggested answers
The maximum mark for this paper is 5.
For each question, choose the answer you consider to be the best.
You can use the Periodic Table at the back of your book.

• 1.

### Which sample contains the smallest amount of oxygen?

• A.

0.3 mol

• B.

0.6 mol

• C.

0.7 mol HCOOH

• D.

0.8 mol

D. 0.8 mol
Explanation
1 mol of  gives 4 mol of O => 0.3 mol of  gives 1.2 mol of O

1 mol of  gives 3 mol of O => 0.6 mol of  gives 1.8 mol of O

1 mol of HCOOH gives 2 mol of O => 0.7 mol of HCOOH gives 1.4 mol of O

1 mol of  gives 1 mol of O => 0.8 mol of  gives 0.8 mol of O

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• 2.

### How many hydrogen atoms are contained in one mole of ethanol, ?

• A.

5

• B.

6

• C.
• D.
D.
Explanation
1 mol of  gives 6 mol of H
no. of H atoms =

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• 3.

### Calculate the number of moles in 8.00 g of sodium hydroxide, NaOH.

• A.

0.05

• B.

0.10

• C.

0.15

• D.

0.20

D. 0.20
Explanation
(NaOH) = 23 + 16 + 1 = 40
amount of NaOH = 8.00/40 = 0.20 mol

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• 4.

### What is the mass, (in grams), of  molecules of ?

• A.

62

• B.

124

• C.

248

• D.

496

C. 248
Explanation
amount of  =  = 2 mol
mass of  = 2 x (31 x 4) = 248 g

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• 5.

### Calculate the number of nitrate ions in 2.00 mol of magnesium nitrate, .

A.
Explanation
1 mol of  gives 2 mol of nitrate ions => 2 mol of  gives 4 mol of nitrate ions.
number of nitrate ions =

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