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Some Basic Concepts of Chemistry question

2014 · Q101
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Some Basic Concepts of Chemistry question

2014 · Q101

NEETChemistrySome Basic Concepts of ChemistryMCQ+4 / −1
1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel, Which reactant is left in excess and how much ? (At. wt. Mg = 24, O = 16)
  1. A
    Mg. 0.16 g
  2. B
    O2, 0.16 g
  3. C
    Mg, 0.44 g
  4. D
    O2 , 0.28 g
View written solutionFree

Correct answer: A

nMg = 1241 \over 24241​ = 0.0416 moles

nO2 = 0.56320.56 \over 32320.56​ = 0.0175 moles

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Mg+${1\over2} O_2$$ \Rightarrow $MgO
Initial0.0416 moles0.0175 moles0
Final( 0.0416 - 2 x 0.0175)
= 0.0066 moles		02 x 0.0175

$ \because $ Mass of Mg left in excess = 0.0066 $ \times $ 24 = 0.16 g
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