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Edexcel IGCSE Chemistry 1.17 Relative Atomic Mass Questions

Calculate relative atomic mass from isotope abundances using a weighted mean, and give the final result to the decimal places or significant figures requested.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • calculate Ar by summing each isotope mass multiplied by its percentage abundance and dividing by 100, or by summing the mass–fraction products when decimal abundances total 1
  • round the calculated relative atomic mass to the decimal places or significant figures specified in the question, retaining enough precision during the calculation

Edexcel IGCSE Chemistry 1.17 Relative Atomic Mass Questions question 1

[Maximum number: 3]

This question is about Group 2 elements and their compounds.

A sample of magnesium contains three isotopes.

Table for Question Edexcel IGCSE Chemistry 1.17 Relative Atomic Mass Questions question 1 — Edexcel IGCSE Chemistry

Calculate the relative atomic mass (Ar)\left(A_{r}\right) of magnesium.

Give your answer to one decimal place.

Ar=A_{r}=
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