Amount of Substance (OCR A-Level Chemistry A): Quizzes

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Amount of Substance and the Mole
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How many particles are in one mole of any substance?

6.02×10236.02 \times 10^{23}

What are the units of the Avogadro constant?

mol−1\text{mol}^{-1}

What is the mass of one mole of carbon atoms?

12.0 g

How many hydrogen atoms are in 1 mol of H2\text{H}_2 molecules?

2×6.02×10232 \times 6.02 \times 10^{23}

What is the molar mass of NO2\text{NO}_2? (ArA_r(N)=14.0, ArA_r(O)=16.0)

46.0 g mol−1^{-1}

Calculate moles in 24.0 g of carbon. (MM(C)=12.0 g mol−1^{-1})

2.0 mol

What mass is 0.25 mol of magnesium? (MM(Mg)=24.3 g mol−1^{-1})

6.08 g

Which formula correctly rearranges n=mMn = \frac{m}{M} to find mass?

m=n×Mm = n \times M

What does 12 g of carbon-12 contain?

6.02×10236.02 \times 10^{23} carbon atoms

For any element, what does molar mass (g mol−1^{-1}) equal?

Relative atomic mass (ArA_r)

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Shapes of Molecules and Intermolecular Forces

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