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. 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.