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If a certain oxide of nitrogen weighing ...

If a certain oxide of nitrogen weighing 0.11 g gives 56 mL of nitrogen and another oxide of nitrogen weighing 0.15 g gives the same volume of nitrogen (both at sTP), show that these results support the law of multiple proportions.

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22400 mL of `N_(2)` at STP weigh = 28 g. Calculate the mass of nitrogen. Then substract from the mass of oxide of nitrogen to calculate the mass of oxygen.
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PRADEEP-SOME BASIC CONCEPTS OF CHEMISTRY-PROBLEMS FOR PRACTICE
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  14. Calculate the volume occupied by 10^(22) molecules of a gas at 300 K a...

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