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Atoms and reactions

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Question 25

What is the number of hydrogen atoms in 0.0750 mol of hydrated barium hydroxide, Ba(OH)2⋅8H2O\text{Ba(OH)}_2 \cdot 8\text{H}_2\text{O}Ba(OH)2​⋅8H2​O?

(Avogadro's constant, NA=6.02×1023 mol−1N_{\text{A}} = 6.02 \times 10^{23}\text{ mol}^{-1}NA​=6.02×1023 mol−1)

A

9.030×10229.030 \times 10^{22}9.030×1022

B

7.224×10237.224 \times 10^{23}7.224×1023

C

8.127×10238.127 \times 10^{23}8.127×1023

D

1.309×10241.309 \times 10^{24}1.309×1024

Markscheme

Atoms and reactions Questions

  1. A Level
  2. /Chemistry
  3. /Atoms and reactions

199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.

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