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Standard IX

Chemistry

Atoms

Which of the ...

Question

Which of the following correctly represents 180 g of water?
(i) 5 moles of water
(ii) 10 moles of water
(iii) $6.023 \times 10^{23}$ molecules of water
(iv) $6.023 \times 10^{24}$ molecules of water

(i)

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(ii)

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(iii)

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(iv)

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Solution

The correct option is C (iv)
$18 g$ of $H_{2} O = 1$ mol
$180 g$ of $H_{2} O = 10$ mol
$18 g$ of $H_{2} O = 6.023 \times 10^{23}$ molecules of $H_{2} O$
$180 g$ of $H_{2} O = \frac{6.023 \times 10^{23}}{18} \times 180$
$= 6.023 \times 10^{24}$ molecules of $H_{2} O$

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Which of the following correctly represents 360 g of water?

(i) 2 moles of $H_{2} O$

(ii) 20 moles of water

(iii) $6.022 \times 10^{23}$ molecules of water

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(ii) 20 moles of water

(iii) $6.022 \times 10^{23}$ molecules of water

(iv)

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(i) 2 moles of $H_{2} O$

(ii) 20 moles of water

(iii) $6.022 \times 10^{23}$ molecules of water

(iv)

1.2044 \times 10^{25}

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Which of the following correctly represents 180 g of water?(i) 5 moles of water(ii) 10 moles of water(iii) 6.023×1023 molecules of water(iv) 6.023×1024 molecules of water

The correct option is C (iv)18 g of H2O=1 mol180 g of H2O=10 mol18 g of H2O=6.023×1023 molecules of H2O180 g of H2O=6.023×102318×180=6.023×1024 molecules of H2O

Which of the following correctly represents 180 g of water?
(i) 5 moles of water
(ii) 10 moles of water
(iii) $6.023 \times 10^{23}$ molecules of water
(iv) $6.023 \times 10^{24}$ molecules of water

The correct option is C (iv)
$18 g$ of $H_{2} O = 1$ mol
$180 g$ of $H_{2} O = 10$ mol
$18 g$ of $H_{2} O = 6.023 \times 10^{23}$ molecules of $H_{2} O$
$180 g$ of $H_{2} O = \frac{6.023 \times 10^{23}}{18} \times 180$
$= 6.023 \times 10^{24}$ molecules of $H_{2} O$