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

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

Answer 1

Answer: (C)

(ii) and (iv)

Answer 2

(3) : 18 g of $H_{2}O$ = 1 mol

$180g$of $H_{2}O$ =10 mol

$6.023 \times 10^{23}$molecules of $H_{2}O$ =18 g of $H_{2}O$

$180gof$ $\mathrm { H } _ { 2 } \mathrm { O }$ $\frac{6.023 \times 1023}{18} \times 180$

=$6.023 \times 24^{24}$molecules of $H_{2}O$