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

  • A 32
  • B 20
  • C 14
  • D 12
jamb 2001chemistry

The correct answer is A. 32

Relative molecular mass of XO2 =2 × vapour density

Relative molecular mass â†’ 32 * 2 = 64

Atomic mass of X:

X + [16 * 2] = 64

X = 64 - 32

=32

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