Question

please answer it fast​

Answer 1

Explanation:

13.

1 mole of substance contains

$6 \times {10}^{23} particles$

So no. of moles of FeCl3 ions which weighs 16.25 grams =>

16.25/162.5 =>0.1 moles Hence the number of Fe3+ ions present in 16.25 grams of FeCl3 =>

$0.1 \times 6.022 \times {10}^{23} = > 6.022 \times {10}^{22}$

So (d) is the correct option.

14. One mole of water (H2O) weighs (2×1+16) grams =>18 grams.

No. of moles of water present in a 10 kg sample => 10 kg/18 gm =>10000 gm/18 gm => 10000/18 => 555 moles approximately. Hope it helps you.