2.1 Purity and separating mixtures

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Question 36

A compound of phosphorus and oxygen has the empirical formula $P2O5\mathrm{P_{2}O_{5}}$ .

The relative formula mass of the compound is 284.0.

What is the molecular formula of the compound?

Relative atomic mass ( $A_{r}$ ): O = 16.0 P = 31.0

[1]

$P2O10\mathrm{P_{2}O_{10}}$

$P4O5\mathrm{P_{4}O_{5}}$

$P4O10\mathrm{P_{4}O_{10}}$

$P6O15\mathrm{P_{6}O_{15}}$

Markscheme

2.1 Purity and separating mixtures Questions

GCSE
Chemistry
2.1 Purity and separating mixtures

102 exam-style questions on OCR GCSE Chemistry 2.1 Purity and separating mixtures, covering 2.1.1 Pure substances and melting point data, 2.1.2 Relative formula mass and empirical formula, 2.1.3 Formulations as useful mixtures, 2.1.4 Techniques for separating mixtures, and 2.1.5 Chromatography and Rf values. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank·2.1 Purity and separating mixtures