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Amount of substance

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Question 52

What is the mass, in mg\text{mg}mg, of carbon formed when 3.5 × 10-4 mol of hexane undergoes incomplete combustion according to the equation below?

2C6H14(l)+7O2(g)→12C(s)+14H2O(g) 2\text{C}_6\text{H}_{14}(\text{l}) + 7\text{O}_2(\text{g}) \rightarrow 12\text{C}(\text{s}) + 14\text{H}_2\text{O}(\text{g}) 2C6​H14​(l)+7O2​(g)→12C(s)+14H2​O(g)

(Use Ar(C)=12.0A_r(\text{C}) = 12.0Ar​(C)=12.0)

A

2.10×1002.10 \times 10^02.10×100

B

4.20×1004.20 \times 10^04.20×100

C

2.52×1012.52 \times 10^12.52×101

D

5.04×1015.04 \times 10^15.04×101

Markscheme

Amount of substance Questions

  1. A Level
  2. /Chemistry
  3. /Amount of substance

79 exam-style questions on AQA A Level Chemistry Amount of substance, covering Relative atomic mass and relative molecular mass, The mole and the Avogadro constant, The ideal gas equation, Empirical and molecular formula, and Balanced equations and associated calculations. Each one has a worked solution and a mark scheme showing where the marks go.

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