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The number of Hydrogen ions in 1.0\(dm^{3}\) of 0.02\(moldm^{-3}\) tetraoxosulphate(VI) acid is   \([N_{A} =...

Chemistry
WAEC 2018

The number of Hydrogen ions in 1.0\(dm^{3}\) of 0.02\(moldm^{-3}\) tetraoxosulphate(VI) acid is   \([N_{A} = 6.02 \times 10^{23}]\)

  • A. \(1.2 \times 10^{22}\)
  • B. \(1.2 \times 10^{23}\)
  • C. \(2.4 \times 10^{22}\)
  • D. \(2.4 \times 10^{23}\)
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Correct Answer: Option A
Explanation

\(1mole = 6.02 \times 10^{23} ions\)

\(0.02moldm^{-3} = 0.02 \times 6.02 \times 10^{23}\)

=\(0.1204 \times 10^{23} = 1.204 \times 10^{22}\)

\(\approxeq 1.2 \times 10^{22}\)


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709