The number of water molecules is maximum in

Asked by admin @ 24/08/2021 in Chemistry viewed by 348 People

The number of water molecules is maximum in....

A) 18 gram of waterB) 18 moles of waterC) 18 molecules of waterD) 1.8 gram of water

Answered by admin @ 24/08/2021

Answer: B) 18 moles of water

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

A) 18 gram of water

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{18g}{18g/mol}=1mole$

1 mole of $H_2O$ contains = $6.023\times 10^{23}$ molecules of water.

B) 18 moles of water

1 mole of $H_2O$ contains = $6.023\times 10^{23}$ molecules of water.

18 moles of $H_2O$ contains = $\frac{6.023\times 10^{23}}{1}\times 18=108.4\times 10^{23}$ molecules of water.

C) 18 molecules of water

D) 1.8 gram of water

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{1.8g}{18g/mol}=0.1mole$

1 mole of $H_2O$ contains = $6.023\times 10^{23}$ molecules of water.

0.1 mole of $H_2O$ contains = $\frac{6.023\times 10^{23}}{1}\times 0.1=6.023\times 10^{22}$ molecules of water.

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