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An oxide XO2 has a vapour density of 32. What is the atomic mass of...

Chemistry
JAMB 2001

An oxide XO2 has a vapour density of 32. What is the atomic mass of X?

  • A. 32
  • B. 20
  • C. 14
  • D. 12
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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Correct Answer: Option A
Explanation

Relative molecular mass of XO2 =2 × vapour density

Relative molecular mass → 32 * 2 = 64
Atomic mass of X:

X + [16 * 2] = 64
X = 64 - 32
=32

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