The Law Of Multiple Proportions?

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ksimmons1991

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I don't fully understand this chemistry question:

The following are the masses of nitrogen that combines with 1 gram (g) of oxygen (O):


1. NO = 1.70g
2. NO 2 = 0.85g
3. NO 4 = 0.44g

Calculate the ratio of the masses of nitrogen in each of the following:
a. NO: NO 2
b. NO 2: NO 4
c. NO: NO 4

* I think the ratio of the mass of nitrogen for the first question is 2:1. Would the next two questions have the same ratio? Please help me.
 
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