Skip to content

Course home

3.1 Introducing chemical reactions

Easy Medium Hard

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Question 19

H

A sample of carbon dioxide, $CO2\mathrm{CO_{2}}$ , contains 3.01 × 10²³ molecules.

What is the mass of the sample?

Relative atomic mass ( $A_r$ ): C = 12.0 O = 16.0

The Avogadro constant is 6.02 × 10²³.

[1]

A

0.50 g

B

22.0 g

C

88.0 g

D

$1.32×10251.32\times10^{25}$ g

Markscheme

3.1 Introducing chemical reactions Questions

GCSE
Chemistry
3.1 Introducing chemical reactions

55 exam-style questions on OCR GCSE Chemistry 3.1 Introducing chemical reactions, covering 3.1.1 Writing formulae and balanced chemical equations, 3.1.2 Formulae of compounds from ions, and state symbols, 3.1.3 Conservation of mass and observed changes in mass, 3.1.4 Half equations and balanced ionic equations, 3.1.5 The mole and the Avogadro constant, and 3.1.6 Stoichiometry, limiting reactants and reacting masses. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank