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

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Online Assignment 1.1: The Mole Concept And Avogadro

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

Questions and Answers

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
Correct Answer
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.
Correct Answer
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
Correct Answer
D. 0.20

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

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1
0
4.

What is the mass, (in grams), of molecules of ?
- A.
  
  62
- B.
  
  124
- C.
  
  248
- D.
  
  496
Correct Answer
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.
- B.
- C.
- D.
Correct Answer
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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1
0