Skip to content

Course home

Question bank·2.6 Calculations involving masses
Sign up

2.6 Calculations involving masses

EasyMediumHard
1234567891011121314151617
Question 6

A sample of sodium oxide has the formula Na2O\mathrm{Na_2O}Na2​O. The relative atomic masses are Na=23\mathrm{Na} = 23Na=23 and O=16\mathrm{O} = 16O=16. What is the correct calculation for its relative formula mass, MrM_rMr​?

[1]
A

(2×23)+16(2 \times 23) + 16(2×23)+16

B

(2×23)×16(2 \times 23) \times 16(2×23)×16

C

23+(2×16)23 + (2 \times 16)23+(2×16)

D

(23+16)×2(23 + 16) \times 2(23+16)×2

Markscheme

2.6 Calculations involving masses Questions

  1. GCSE
  2. /Chemistry
  3. /2.6 Calculations involving masses

142 exam-style questions on Edexcel GCSE Chemistry 2.6 Calculations involving masses, covering 2.6.1 Relative formula mass and percentage composition, 2.6.2 Empirical and molecular formulae, 2.6.3 Conservation of mass, 2.6.4 Reacting masses and concentration in g dm⁻³, 2.6.5 The mole and the Avogadro constant, and 2.6.6 Limiting reactants and stoichiometry. Each one has a worked solution and a mark scheme showing where the marks go.

More questions