Free Printable Numericals on Mole Concept Class 9

1.

Which of the following has the most number of moles present?

a)

5.75 g of Na (Sodium)

b)

$3.011\ \cdot\ 10^{23\ }$ atoms of Cl (Chlorine)

c)

96 g of S (Sulphur)

d)

$6.022\cdot10^{23}$ atoms of Pb (Lead)

2.

Calculate the mass of

0.75275\ \cdot10^{23}

atoms of Calcium

a)

5 g

b)

10 g

c)

40 g

d)

20 g

e)

None of the above

3.

One atom of element X weighs

6.644\ \cdot10^{-23}

g . Name element X and categorize it as a metal or non-metal

a)

Phosphorus, Non-Metal

b)

Calcium, Metal

c)

Scandium, Non-Metal

d)

Potassium, Metal

4.

Calculate the formula mass of $NaHCO_3$

a)

81 u

b)

82 u

c)

83 u

d)

84 u

5.

20 g of Water = X moles . Find X

a)

1.15

b)

1.13

c)

1.11

d)

1.12

6.

Calculate the number of Aluminium ions present in 0.051 g of Aluminium Oxide

a)

6.022\cdot10^{19}

ions

b)

$6.022\cdot10^{20}$ ions

c)

$3.001\cdot10^{19}$ ions

d)

$3.001\cdot10^{18}$ ions

7.

Find the molar mass of Ethyne $C_2H_2$

a)

24 g

b)

25 g

c)

26 g

d)

24 g

8.

Calculate the molar mass of 2.8 moles of Calcium Carbonate

a)

280 g

b)

560 g

c)

140 g

d)

70 g

9.

Calculate the mass of 0.5 moles of $N_2$ gas

a)

7 g

b)

6 g

c)

6.98 g

d)

7. 2 g

e)

None of the above

10.

What is the atomic mass of an element whose two isotopes are present in the ratio 3:1? (The element is used as a disinfectant)

a)

35 u

b)

36 u

c)

35.45 u

d)

36.5 u

e)

None

Numericals on Mole Concept Class 9

Total questions: 10

Worksheet time: 9mins

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