Ardingly - Remove - Moles lesson 2

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•

Chemistry

•

10th Grade

•

Medium

Donald Walmsley

Used 2+ times

FREE Resource

5 Slides • 21 Questions

Moles Lesson 2

Recap - Main points from lesson 1

A mole is just a counting unit for particles, just like a dozen is a counting unit for eggs.
The mass of one mole of any atom is the same as its relative mass (from the periodic table) in grams.
The relative molecular mass (M_r) of a compound is the sum of the relative atomic mass of all the atoms in that compound.
To convert between mass, moles and Mr, use the moles triangle.

Multiple Choice

How many moles of magnesium in a 20g strip?

0.81

0.82

0.83

0.84

Multiple Choice

How many moles of water in a 250ml glass?

Clue: 1ml=1g

13.4

13.8

14.0

15.2

Multiple Choice

What is the molar mass of calcium hydroxide, Ca(OH)₂?

74 g

57 g

58 g

38 g

Multiple Choice

Which has more molecules?

1 mole H₂O

1 mole Al(OH)₃

1 mole NaCl

There are all the same

Multiple Choice

What is the mass of one mole of sulphur?

10 g

12 g

32 g

44 g

Multiple Choice

Which of the following would have the highest number of moles?

4g CO₂

15g H₂O

22g NaCl

100g AgCl

Multiple Choice

Which of the following would have more mass?

1 mole of Li

1 mole of Au

1 mole of Si

None, all are equal

Multiple Choice

0.5 moles of an unknown substance has a mass of 22g. Calculate the Mr.

Moles - lesson 2

Part 2 - percentage by mass

In this lesson we will learn how to calculate the percentage by mass of a particular element in a compound

% by mass - Worked example 1

Q. what is the percentage by mass of chlorine in magnesium chloride - Mg Cl₂ ?

% by mass - Worked example 2

Q. what is the percentage by mass of nitrogen in ammonium nitrate- NH₄NO₃ ?

Multiple Choice

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

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

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

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

% mass of element = mass of element in the compound

Multiple Choice

What is the percent by mass of chlorine in NaCl?

39%

61%

35%

Multiple Choice

What is the percent by mass of magnesium in MgO?

20%

40%

50%

60%

Multiple Choice

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

24%

49%

65%

Multiple Choice

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

24%

49%

51%

65%

Multiple Choice

Percentage composition of a compound tells you the percentage of the mass made up by each element in a compound.

TRUE

FALSE

Multiple Choice

Find the percent composition of Cu₂S?

%Cu= 67.987 %S= 32.013

%Cu= 79.854 %S= 20.145

%Cu= 35.946 %S= 64.054

Multiple Choice

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

None

Multiple Choice

How many percent of carbon is present in chloroform?

10.06%

0.84%

89.09%

99.99%

Multiple Choice

How many percent of chlorine is present in chloroform?

10.06%

0.84%

89.09%

99.99%

Multiple Choice

Find the percentage composition of Mg in Mg₃(PO₄)₂.

27.48% Mg

43.11% Mg

16.00% Mg

12.63% Mg

Multiple Choice

What is the percentage of oxygen in carbon dioxide? (CO2)

27.3%

72.7%

30%

70%

Multiple Choice

What is the percentage of OH^–in Ca(OH)₂?

45.9%

75%

66.6%

90.1%

Moles Lesson 2

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