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2.1 Purity and separating mixtures

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Question 4

A chemist analyses a molecular compound, U. The empirical formula of U is C2H4O\mathrm{C_{2}H_{4}O}C2​H4​O and its relative formula mass is 88.0.

ElementHCO
Relative atomic mass (ArA_rAr​)1.012.016.0

Which statement is correct?

[1]
A

The molecular formula of U is C2H4O2\mathrm{C_{2}H_{4}O_{2}}C2​H4​O2​.

B

The molecular formula of U is C4H8O\mathrm{C_{4}H_{8}O}C4​H8​O.

C

The molecular formula of U is C2H4O\mathrm{C_{2}H_{4}O}C2​H4​O.

D

The molecular formula of U is C4H8O2\mathrm{C_{4}H_{8}O_{2}}C4​H8​O2​.

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2.1 Purity and separating mixtures Questions

  1. GCSE
  2. /Chemistry
  3. /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.

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