Question #cde77

Question

3816 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2016-02-25T17:25:00

(a) and (b) are both equivalent and are the correct answers.

First work out the number of moles of water in this 36 grams :

$n = \frac{m}{M_{r}}$ $n=m/(M_r)$

$= \frac{36}{1 + 1 + 16}$ $=36/(1+1+16)$

$= 2 m o l$ $=2mol$ .

But 1 mole has $6.023 \times 10^{23}$ $6.023xx10^23$ particles.

Hence 2 moles will have $1.2046 \times 10^{24}$ $1.2046xx10^24$ molecules.

This may also be written as $12.046 \times 10^{23}$ $12.046xx10^23$ .

Thus the correct answer is both (a) and (b) as they are equivalent.