Relative Atomic Mass and Relative Molecular Mass

The mass of a tungsten atom is 2.4 times greater than the mass of a neon atom. What is the relative atomic mass of tungsten?

[RAM: Ne, 20]

• 8

• 22

• 48

• 52

How many oxygen atoms have equal mass with two magnesium atoms?

[RAM: O, 16; Mg, 24]

• 2

• 3

• 4

• 5

Four atoms of element X have the same mass with 11 atoms of sulphur. What is the relative atomic mass of element X?

[RAM: S, 32]

• 44

• 88

• 128

• 352

An oxide of nitrogen has the formula, N₂O₄. What is its relative molecular mass?

[RAM: N, 14; O, 16]

• 76

• 78

• 92

• 120

How many times is a water molecule heavier than a hydrogen molecule?

[RAM: H, 1; O, 16]

• 2

• 8

• 9

• 18

Sodium thiosulphate has the formula of Na₂S₂O₃ . 5H₂O. What is its relative formula mass?

[RAM: H, 1; O, 16; Na, 23; S, 32]

• 158

• 232

• 248

• 264

Silica gel contains a sodium compound with the formula Na₂Si₄O_y. If the relative formula mass of the compound is 302, what is the value of y?

[RAM: O, 16; Na, 23; Si, 28]

• 8

• 9

• 10

• 12

The average mass of nitrogen gas is 28 times greater than that of the mass of 1/12 carbon-12 atom. Calculate the relative atomic mass of nitrogen.

• 1

• 2

• 14

• 28

The relative molecular mass of substance PR₂ is 95. If the relative atomic mass of an element of atom R is 35.5, calculate the relative atomic mass of an atom of element P.

• 8

• 24

• 16

• 64

An oxide of element Q has a formula Q₃O₄ and relative formula mass of 145. Calculate the relative atomic mass of element Q.

[RAM: O = 16]

• 18

• 27

• 44

• 50