3.1: Relative atomic mass and relative molecular mass

Define relative atomic mass.

Mass of a sulphur atom is 2 times greater than that of the mass of an oxygen atom. What is the relative atomic mass for sulphur?

[ AR : O,16]

• 30

• 31

• 32

• 33

How many magnesium atoms will have the same mass as two silver atom?

[AR : Mg,24 ; Ag,108 ]

• 9

• 10

• 11

• 12

Calculate the relative molecular mass of water.

[ AR : H,1 ; O, 16]

• 17

• 18

• 19

• 20

Calculate the relative molecular mass of ammonia.

[ AR: N,14 ; H,1 ]

• 16

• 17

• 18

• 19

Calculate the relative molecular mass of carbon dioxide.

[AR : C, 12 ; O,16 ]

• 28

• 30

• 40

• 44

Calculate the relative molecular mass of ethanol, C2H5OH.

[ AR: C, 12; H, 1; O,16 ]

• 46

• 48

• 50

• 52

Calculate the relative formula mass of aluminium sulphate.

[ AR : Al,27 ; S, 32 ; O,16 ]

• 342

• 330

• 310

• 350

Calculate the relative molecular mass of hydrated copper(II)sulphate.

[ AR : Cu,64 ; S, 32 ; O,16 ]

• 245

• 250

• 255

• 260