Question

How many grams does 4.00 moles of h2o weigh?

Answer 1

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.

Answer 2

Moles = given mass ÷ molecular mass

So
Given mass = moles × molecular mass

m = 4 × 18
m = 72 gram

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