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Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given : Molar mass of Mg is 24 ~g ~mol ⁻¹ .

Options

  1. A235.7 g
  2. B0.24 mg
  3. C236 mg
  4. D2.444 g

Correct answer

C. 236 mg

Step-by-step solution

Mg +2 HCl MgCl ₂+ H ₂ Volume H ₂ evolved =220 ml Mole of H ₂= 220 10⁻³ 22.4 = mole of Mg used aligned Mass of Mg used & = 220 10⁻³ 22.4 24 & =235.7 10⁻³ gm & =235.7 mg aligned

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