Question

One mole of $(N{H}_4{)}_{2}C{r}_3{O}_7$ contains :

• A. $1$ mole of nitrogen.
• B. $4$ moles of hydrogen.
• C. $1$ mole of chromium.
• D. $7$ moles of oxygen.

Answer 1

The correct option is D $7$ moles of oxygen.

One mole of $(N{H}_4{)}_{2}C{r}_3{O}_7$ contains:
$2$ mole $N$
$8$ mole $H$
$3$ mole $Cr$
$7$ mole $O$.