`H_2` gas produced by the reaction
`Zn + 2HCl to ZnCl_2 + H_2`
is collected over water. If 0.3 g of Zn are consumed at `27^@C` in the reaction, calculate the volume of hydrogen produced. (Given : Barometric reading = 750 mm, Aqueous tension at `27^@C` = 25 mm, Atomic weight of Zn = 65.4).

Explanation

To solve the problem of calculating the volume of hydrogen gas produced from the reaction of zinc and hydrochloric acid, we will follow these steps:

### Step 1: Calculate the moles of Zinc (Zn)
We start with the mass of zinc consumed in the reaction, which is given as 0.3 g. To find the number of moles of zinc, we use the formula:

\[ \text{Moles of Zn} = \frac{\text{Mass of Zn}}{\text{Molar mass of Zn}} \]
...