if you have 90gm of water molecules calculate the total number of atom
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It is equal to Avogadro's number (NA), namely 6.022 x1023. If we have one mole of water, then we know that it will have a mass of 2 grams (for 2 moles of H atoms) + 16 grams (for one mole O atom) = 18 grams. Since we only have 0.001 grams, that means that we have NA * (0.001/18) = 3.35*1019 moleculesof water!
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We have 90g of water so we have90/18 = 5 moles of water. The numberof molecules in a mole is always the same number, called Avogadro'snumber, which is 6.02 X 10 to the power of 23.
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