Question

calculate the mass of 10 to the power 20 molecules of water​

Answer 1

Answer:

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Answer 2

Molar mass of H2O is 18 grams.

So, 1 mol of H2O weighs 18 grams.

As, 1 mol= 6.023 * 10^23 molecules of water.

So, 6.023 * 10^23 molecules of water have a mass of 18 grams.

Mass of 10^20 molecules of water is equal to x grams.

mass of 10^20 molecules of water(x)= (18* 10^20)/(6.023*10^23)

=>x=(18/6.023) * 10^-3

x=2.988 * 10^-3

x= 0.002988 grams.

x=0.003 grams (approx.)