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

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

Explanation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»M«/mi»«mi»r«/mi»«/msub»«/math»(NaOH) = 23 + 16 + 1 = 40 «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»g«/mi»«mo»§nbsp;«/mo»«mi»m«/mi»«mi»o«/mi»«msup»«mi»l«/mi»«mrow»«mo»-«/mo»«mn»1«/mn»«/mrow»«/msup»«/math»

amount of NaOH = 8.00/40 = 0.20 mol
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About This Quiz
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... see moreanswer you consider to be the best.
You can use the Periodic Table at the back of your book. see less

2. Which sample contains the smallest amount of oxygen?

Explanation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»H«/mi»«mn»2«/mn»«/msub»«mi»S«/mi»«msub»«mi»O«/mi»«mn»4«/mn»«/msub»«mo»§nbsp;«/mo»«mo»§#8594;«/mo»«mo»§nbsp;«/mo»«mn»2«/mn»«mi»H«/mi»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mi»S«/mi»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mn»4«/mn»«mi»O«/mi»«/math»

1 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»H«/mi»«mn»2«/mn»«/msub»«mi»S«/mi»«msub»«mi»O«/mi»«mn»4«/mn»«/msub»«/math» gives 4 mol of O => 0.3 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»H«/mi»«mn»2«/mn»«/msub»«mi»S«/mi»«msub»«mi»O«/mi»«mn»4«/mn»«/msub»«/math» gives 1.2 mol of O



«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«mo»§nbsp;«/mo»«mo»§#8594;«/mo»«mo»§nbsp;«/mo»«mn»3«/mn»«mi»O«/mi»«/math»

1 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«/math» gives 3 mol of O => 0.6 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«/math» gives 1.8 mol of O



«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»H«/mi»«mi»C«/mi»«mi»O«/mi»«mi»O«/mi»«mi»H«/mi»«mo»§nbsp;«/mo»«mo»§#8594;«/mo»«mo»§nbsp;«/mo»«mn»2«/mn»«mi»H«/mi»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mi»C«/mi»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mn»2«/mn»«mi»O«/mi»«/math»

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





«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»H«/mi»«mn»2«/mn»«/msub»«mi»O«/mi»«mo»§nbsp;«/mo»«mo»§#8594;«/mo»«mo»§nbsp;«/mo»«mn»2«/mn»«mi»H«/mi»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mi»O«/mi»«/math»

1 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»H«/mi»«mn»2«/mn»«/msub»«mi»O«/mi»«/math» gives 1 mol of O => 0.8 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»H«/mi»«mn»2«/mn»«/msub»«mi»O«/mi»«/math» gives 0.8 mol of O
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3. What is the mass, (in grams), of Â«math xmlns=¨https://www.w3.org/1998/Math/MathML¨»«mn»1«/mn»«mo».«/mo»«mn»2«/mn»«moȤnbsp;«/mo»«mi»x«/mi»«moȤnbsp;«/mo»«msup»«mn»10«/mn»«mn»24«/mn»«/msup»«/math» molecules of Â«math xmlns=¨https://www.w3.org/1998/Math/MathML¨»«msub»«mi»P«/mi»«mn»4«/mn»«/msub»«/math»?

Explanation

amount of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»P«/mi»«mn»4«/mn»«/msub»«/math» = «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mfrac»«mrow»«mn»1«/mn»«mo».«/mo»«mn»2«/mn»«mo»§nbsp;«/mo»«mi»x«/mi»«mo»§nbsp;«/mo»«msup»«mn»10«/mn»«mn»24«/mn»«/msup»«/mrow»«mrow»«mn»6«/mn»«mo».«/mo»«mn»0«/mn»«mo»§nbsp;«/mo»«mi»x«/mi»«mo»§nbsp;«/mo»«msup»«mn»10«/mn»«mn»23«/mn»«/msup»«/mrow»«/mfrac»«/math» = 2 mol

mass of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»P«/mi»«mn»4«/mn»«/msub»«/math» = 2 x (31 x 4) = 248 g

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4. Calculate the number of nitrate ions in 2.00 mol of magnesium nitrate, Â«math xmlns=¨https://www.w3.org/1998/Math/MathML¨»«mi»M«/mi»«mi»g«/mi»«mo»(«/mo»«mi»N«/mi»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«msub»«mo»)«/mo»«mn»2«/mn»«/msub»«/math».

Explanation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»M«/mi»«mi»g«/mi»«mo»(«/mo»«mi»N«/mi»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«msub»«mo»)«/mo»«mn»2«/mn»«/msub»«mo»§nbsp;«/mo»«mo»§#8594;«/mo»«mo»§nbsp;«/mo»«mi»M«/mi»«msup»«mi»g«/mi»«mrow»«mn»2«/mn»«mo»+«/mo»«/mrow»«/msup»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mn»2«/mn»«mi»N«/mi»«msup»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«mo»-«/mo»«/msup»«/math»

1 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»M«/mi»«mi»g«/mi»«mo»(«/mo»«mi»N«/mi»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«msub»«mo»)«/mo»«mn»2«/mn»«/msub»«/math» gives 2 mol of nitrate ions => 2 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mi»M«/mi»«mi»g«/mi»«mo»(«/mo»«mi»N«/mi»«msub»«mi»O«/mi»«mn»3«/mn»«/msub»«msub»«mo»)«/mo»«mn»2«/mn»«/msub»«/math» gives 4 mol of nitrate ions.

number of nitrate ions = «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»4«/mn»«mo»§nbsp;«/mo»«mi»x«/mi»«mo»§nbsp;«/mo»«mn»6«/mn»«mo».«/mo»«mn»0«/mn»«mo»§nbsp;«/mo»«mi»x«/mi»«mo»§nbsp;«/mo»«msup»«mn»10«/mn»«mn»23«/mn»«/msup»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mn»2«/mn»«mo».«/mo»«mn»4«/mn»«mo»§nbsp;«/mo»«mi mathvariant=¨bold-italic¨»x«/mi»«mo»§nbsp;«/mo»«msup»«mn»10«/mn»«mn»24«/mn»«/msup»«/math»
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5. How many hydrogen atoms are contained in one mole of ethanol, Â«math xmlns=¨https://www.w3.org/1998/Math/MathML¨»«msub»«mi»C«/mi»«mn»2«/mn»«/msub»«msub»«mi»H«/mi»«mn»5«/mn»«/msub»«mi»O«/mi»«mi»H«/mi»«/math»?

Explanation

«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»C«/mi»«mn»2«/mn»«/msub»«msub»«mi»H«/mi»«mn»5«/mn»«/msub»«mi»O«/mi»«mi»H«/mi»«mo»§nbsp;«/mo»«mo»§#8594;«/mo»«mo»§nbsp;«/mo»«mn»2«/mn»«mi»C«/mi»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mn»6«/mn»«mi»H«/mi»«mo»§nbsp;«/mo»«mo»+«/mo»«mo»§nbsp;«/mo»«mi»O«/mi»«/math»

1 mol of «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«msub»«mi»C«/mi»«mn»2«/mn»«/msub»«msub»«mi»H«/mi»«mn»5«/mn»«/msub»«mi»O«/mi»«mi»H«/mi»«/math» gives 6 mol of H

no. of H atoms = «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mn»6«/mn»«mo»§nbsp;«/mo»«mi»x«/mi»«mo»§nbsp;«/mo»«mn»6«/mn»«mo».«/mo»«mn»0«/mn»«mo»§nbsp;«/mo»«mi»x«/mi»«mo»§nbsp;«/mo»«msup»«mn»10«/mn»«mn»23«/mn»«/msup»«mo»§nbsp;«/mo»«mo»=«/mo»«mo»§nbsp;«/mo»«mn»3«/mn»«mo».«/mo»«mn»6«/mn»«mo»§nbsp;«/mo»«mi mathvariant=¨bold-italic¨»x«/mi»«mo»§nbsp;«/mo»«msup»«mn»10«/mn»«mn»24«/mn»«/msup»«/math»
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Calculate the number of moles in 8.00 g of sodium hydroxide, NaOH.
Which sample contains the smallest amount of oxygen?
What is the mass, (in grams), of  molecules of ?
Calculate the number of nitrate ions in 2.00 mol of magnesium...
How many hydrogen atoms are contained in one mole of ethanol, ?
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