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NEET 2014

Exam: NEET
Year: 2014
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

NEET 2014 · Chemistry · Some Basic Concepts of Chemistry

1.0g of magnesium is burnt with 0.56g O _ 2 in a closed vessel....

1.0g

of magnesium is burnt with

0.56g

{O}_{2}

in a closed vessel. Which reaction is left in excess and how much? (At, wt.

Mg = 24; O = 16 )

Options

A $Mg, 0.16g$
B ${O}_{2}, 0.16g$
C $Mg, 0.44g$
D ${O}_{2}, O . 28g$

Correct answer

A. $Mg, 0.16g$

Step-by-step solution

Mg + \dfrac{1}{2}{O}_{2} \to MgO

\dfrac{1.0}{24}\dfrac{0.56}{32}

\dfrac{0.5}{12}\dfrac{0.07}{4}

Oxygen is limiting reagent so

\dfrac{0.07}{4} - \dfrac{x}{2} = 0

x = \dfrac{0.07}{2}

excess

Mg = \dfrac{0.5}{12} - \dfrac{0.07}{2}

mole
mass of

Mg

is

= 1 - 0.7 \times 12 = 0.16gram .

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