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

Q. At STP, the volume of ammonia formed using 1 mole of nitrogen and 4 moles of hydrogen on complete reaction is:

Q. One mole of $H_{2}O$ contains moles of hydrogen atoms.

Q. One mole of ${\text{H}}_2\text{O}$ contains two moles of hydrogen atoms.

Q. A flask contains oxygen, nitrogen, and helium. There are $5moles$ of nitrogen, $4moles$ of helium, and $1mole$ of oxygen. If the total pressure in the flask is $10,000$ torr, then:
I. The partial pressure of helium is $5000torr$
II. The partial pressure of nitrogen is $5000torr$
III. The partial pressure of oxygen is $1000torr$