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Solution: The ratio of the mass of a nitrogen atom to the mass of an a...

Question

The ratio of the mass of a nitrogen atom to the mass of an atom of   12C is 7:6 and the ratio of the mass of nitrogen to oxygen in N2O is 7:4. Find the mass of 1 mol of oxygen atoms.

Video Transcript

Hey guys, in this question we're given some information and at the end they asked us to find 1 mole of oxygen atoms, now before we do that final part let's just go over the initial part of this question so they tell us here that the ratio of Nitrogen to Carbon is 7 to 6, why? Because here Nitrogen weighs 14 grams on the periodic table Carbon weighs 12 grams both these numbers are divisible by 2 so if you divide them both by 2 you'll get 7 and 6 so that's where they're coming up with the ratio of 7 to 6, next they tell me that an N2O we have a ratio that is 7 to 4, how is that possible? Well again Nitrogen weighs 14 grams but there's 2 of them so that's 28 grams, Oxygen again weighs 16 grams both of these numbers are divisible by 4 so that's how they came up with this 7 to 4 ratio.

Now the final part of for the question, just asked us to find the mass of 1 mole of oxygen atoms that's just the simple conversion so we have 1 mole oxygen here, we have 16 grams that's how much an Oxygen atom weighs on the periodic table so here it would be 16 grams per mole, OK? So here we showed how the ratios we're obtained and then here this just represents the mass of 1 mole of Oxygen atoms