Question

Which of the following correctly represent 360 gms of water?
(i) 2 moles of $H_{2}O$
(ii) 20 moles of water
(iii) $46.022\times {10}^{23}$ molecules of water
(iv) $1.2044\times {10}^{25}$ molecules of water

• A. (i)
• B. (i) and (iv)
• C. (ii) and (iii)
• D. (ii) and (iv)

Answer 1

The correct option is D (ii) and (iv)

The molar mass of water is 18 g/mol.
360 g of water corresponds to $\frac{360g}{18g/mol}=20mol$.
It is also equal to $20mol\times 6.023\times {10}^{23}molecules/mol=1.2044\times {10}^{25}molecules$.
Thus, the options (ii) and (iv) correctly represents 360 g of water.