Relative atomic mass (Edexcel GCSE Chemistry Combined Science): Quizzes

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1.1.9 Relative Atomic Mass (Ar)
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What is relative atomic mass (ArAr) compared to?

112\frac{1}{12} mass of carbon-12 atom

What does relative atomic mass (ArAr) take into account?

Abundance of each isotope

What type of average is relative atomic mass (ArAr)?

Weighted average of all isotopes

Why is ArAr not always a whole number?

Different isotopes contribute to it

Is ArAr the same as the mass number of a single atom?

No, mass number is for one isotope

What is the ArAr of chlorine with 75% Cl-35 and 25% Cl-37?

35.5

Where are relative atomic masses listed?

On the periodic table

What is ArAr used to calculate?

Moles and relative formula mass

What is the formula linking moles, mass, and ArAr?

Moles=MassAr\text{Moles} = \frac{\text{Mass}}{Ar}

If element X has 80% X-20 and 20% X-22, what is its ArAr?

20.4

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The mole

Relative atomic mass

Relative formula Mass

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Empirical formula example

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The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

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The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

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The mole

Relative atomic mass

Relative formula Mass

Percentage composition example

Empirical formula example

Molecular formula example

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