How many moles are in 2g of H2O
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1/9 moles

Explanation:

No of moles = mass/molar mass

No of moles = 2g/18gmol-1

No of moles = 1/9 moles

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

< 3

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.