Question 10

(10 marks)

For the multiple choice questions choose the correct response and show your

working including formulas.

I.

6.022 x 10²² atoms of aluminium make up how many moles of aluminium?

a.

6.02 mol

b.

1.0 mol

10 mol

d. 0.1 mol

II.

C.

How many atoms of bromine are there in 3 moles of Br?

a. 18.066 x 1023 atoms

b. 1.8066 x 1023 atoms

c. 18.066 x 1024 atoms

d. 1.8066 x 1026 atoms/nIV.

IV.

V.

The molar mass of 1 mole of O₂ is?

a. 15.998 gmol¹¹

b. 63.9976 gmol-¹

C. 31.996 x 10²3 gmol-¹

d. 31.996 gmol¹

How many molecules of carbon dioxide are in 15 moles?

a.

6.022 x 10²³ molecules

b.

9.033 x 10²² molecules

6.022 x 10²4 molecules

d. 9.033 x 1024 molecules

C.

Calculate the moles of KCI in 23g?

e. 74.555 mol

f. 0.65 mol

g.

0.308 mol

d. 1.38 x 1025 mol

Thong