The molecular mass of ammonia is 17. a)How much is the GMM of ammonia.
b)Find out the number moles of molecules present in 170g of ammonia.
c)Calculate the number of ammonia molecules present in the above.

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explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

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