The number of molecules in $2.5$ moles of water is:

6.023 \times 10^{23}

molecules

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12.046 \times 10^{23}

molecules

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2.012 \times 10^{23}

molecules

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15 \times 10^{23}

molecules

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Solution

The correct option is B $15 \times 10^{23}$ molecules
As we know, one mole of each substance contains $N_{A} = 6.023 \times 10^{23}$ molecules.
So, $2.5$ moles of water will have $N = 2.5 \times 6.023 \times 10^{23} = 15 \times 10^{23}$ molecules.

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Q. Which of the following correctly represents 180 g of water?
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(ii) 10 moles of water
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6.023 \times 10^{23}

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12.046 \times 10^{23}

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Mole fractions of A and B in a mixture in which $6.023 \times 10^{23}$ molecules of A and $10.4 \times 10^{23}$ molecules of B are present are:

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The number of molecules in 2.5 moles of water is:

The correct option is B 15×1023 moleculesAs we know, one mole of each substance contains NA=6.023×1023 molecules.So, 2.5 moles of water will have N=2.5×6.023×1023=15×1023 molecules.

The number of molecules in $2.5$ moles of water is:

The correct option is B $15 \times 10^{23}$ molecules
As we know, one mole of each substance contains $N_{A} = 6.023 \times 10^{23}$ molecules.
So, $2.5$ moles of water will have $N = 2.5 \times 6.023 \times 10^{23} = 15 \times 10^{23}$ molecules.