90g of H2O is equal to how many moles of H2O ? ​

5 moles

Explanation:

For water we have 2 hydrogen atoms and one oxygen, so the atomic weight of water is 1+1+16=18, so a mole of water is 18 grams. We have 90g of water so we have 90/18 = 5 moles of water.

zfoods? ok, pressure is used to keep the heat inside and to keep the food perfect.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.