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  • Help me answer: What is the ratio of the masses of the Oxygen that combine with a fixed value of Nitrogen in the compounds Nitrogen monoxide and Nitrogen dioxide?

What is the ratio of the masses of the Oxygen that combine with a fixed value of Nitrogen in the compounds Nitrogen monoxide and Nitrogen dioxide?
 

  • Option 1)

    2 : 3

  • Option 2)

    2 : 1

  • Option 3)

    3 : 2

  • Option 4)

    1 : 2

 

Answers (1)

As we learnt in 

Law of multiple proportion -

If two elements can combine to form more than one compund, the masses of one element that combines with a fixed mass of other element are in ratio of small whole numbers.

- wherein

H_{2} + \frac{1}{2}O_{2}\rightarrow H_{2}O

2g        16g          18g

H_{2} +O_{2}\rightarrow H_{2}O_{2}

2g        32g        34g

masses of oxygen combining with a fixed mass of hydrogen have ratio 16:32 => 1:2

 

 

Lets take NO first,

\frac{Mass\;of\;N}{mass\;of\;O} = \frac{14}{16} = 1:1.143

in NO2,

\frac{Mass\;of\;N}{mass\;of\;O} = \frac{14}{32} = 1:2.286

\therefore\frac{Mass\;of\;O\;in\;NO}{mass\;of\;O\;in\;NO_{2}} = \frac{1.143}{2.286} = 1:2

 


Option 1)

2 : 3

Incorrect

Option 2)

2 : 1

Incorrect

Option 3)

3 : 2

Incorrect

Option 4)

1 : 2

Correct

Posted by

Vakul

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