Question

Which of the following represents the formula of a substance which contains about 26% nitrogen and 74% oxygen?
(a) N2O
(b) NO
(C) NO2
(d) N2O5
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Answer 1

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Answer:

N2O5

for nitrogen, 26/14=1.85

for oxygen, 74/16=4.625

dividing the the found numbers buy smallest one that is 1.85.

1.85/1.85=1

4.625/1.85=2.5

multiplying both by 2,

we get N2O5.

Answer 2

Answer:

The Correct answer is d which is N2O5. Explanation is following

Explanation:

To Simply check what is exact percentage of the species is,you have simply remember their atomic weights.

For example:

N2 =    14*2= 28    

O5=     16*5=80

TOTAL=  80+28= 108

NOW USE PERCENTAGE FORMULA

% Amount of N2 will be =  (28/108)*100= 26

Remaining will be Oxygen=  199-26= 74%

I hope its clear now