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The atomic weight of metal in the oxide with the formula, \(\mathrm{M_2O_3}\) that contains 30% oxygen is

Question and options

The atomic weight of metal in the oxide with the formula, M2O3\mathrm{M_2O_3} that contains 30% oxygen is
  1. 50
  2. 84
  3. 124
  4. 56

Answer and explanation

Correct answer: D - 56
M2O3\mathrm{M_2O_3}: 482M+48=0.30\frac{48}{2M + 48} = 0.30, so 2M+48=1602M + 48 = 160 and M=56M = 56.

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