Quick questions on Relative masses and the mole explained: O-Level Chemistry

3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is q1?

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Calculate the relative molecular mass of carbon dioxide,

\text{CO}_2

. (Ar: C = 12, O = 16.) [1 mark]

What is q2?

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Calculate the amount, in moles, in

20.0\ \text{g}

of sodium hydroxide,

\text{NaOH}

. (Ar: Na = 23, O = 16, H = 1.) [2 marks]

What is q3?

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Calculate the number of molecules in

0.20

mol of methane. (Avogadro constant

= 6.0 \times 10^{23}

per mol.) [1 mark]

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