How many moles of water, h2o, contain 2.0×1022 molecules of water?

Asked by maham237 @ 17/12/2020 in Chemistry viewed by 444 People

How many moles of water, H2O, contain 2.0×1022 molecules of water? (See the hints for assistance in interpreting scientific notation.)
Express the quantity in moles to two significant figures.

Answered by maham237 @ 17/12/2020

Answer : The number of moles of water is, $3.3\times 10^{-2}$

Solution : Given,

Number of water molecules = $2.0\times 10^{22}$

As we know that 1 mole of water molecule contains $6.022\times 10^{23}$ number of water molecules.

As, $6.022\times 10^{23}$ number of water molecules present in 1 mole of water molecule

So, $2.0\times 10^{22}$ number of water molecules present in $\frac{2.0\times 10^{22}}{6.022\times 10^{23}}=3.3\times 10^{-2}$ mole of water molecule

Therefore, the number of moles of water is, $3.3\times 10^{-2}$

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