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NEET2014ChemistrySome Basic Concepts of ChemistryActual

1.0   g of magnesium is burnt with 0.56   g O 2 in a closed vessel. Which reaction is left in excess and how much? (At, wt. M g = 24 ;     O = 16 )

Options

  1. AM g , 0.16 g
  2. BO 2 , 0.16 g
  3. CM g , 0.44 g
  4. DO 2 , O . 28 g

Correct answer

A. M g , 0.16 g

Step-by-step solution

M g + 1 2 O 2 → M g O 1.0 24         0.56 32 0.5 12         0.07 4 Oxygen is limiting reagent so 0.07 4 - x 2 = 0 x = 0.07 2 excess M g = 0.5 12 - 0.07 2 mole mass of M g is = 1 - 0.7 × 12 = 0.16   g r a m .

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