Question

The density of liquid mercury is $13.6gc{m}^{-3}$. How many moles of mercury are there in 1 litre of the metal?

(Atomic mass of $Hg=200$)

Answer 1

Volume $=1l$ density $=13.6g/{cm}^3$

$=1000ml=1000{cm}^3$

density $=\frac{mass}{volume}$

$\therefore$ mass of mercury $=(13.6\times 1000)gm$

$=13600gm$

Moles of $Hg=\frac{weight}{atomicmassofHg}$

$\Rightarrow \frac{13600}{200}=68moles$