<u>Answer:</u> The pressure exerted by hydrogen gas is 0.33 atm
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
Given mass of zinc = 2.57 g
Molar mass of zinc = 65.4 g/mol
Putting values in above equation, we get:
We are given:
Moles of HCl = 0.500 moles
For the given chemical equation:
By Stoichiometry of the reaction:
1 mole of zinc reacts with 2 moles of HCl
So, 0.039 moles of zinc will react with = of HCl
As, given amount of HCl is more than the required amount. So, it is considered as an excess reagent.
Thus, zinc metal is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
1 mole of zinc reacts with 1 mole of Hydrogen gas
So, 0.039 moles of zinc will react with = of hydrogen gas
To calculate the pressure of hydrogen gas, we use the equation given by ideal gas:
PV = nRT
where,
P = Pressure of hydrogen gas = ?
V = Volume = 3.00 L
n = number of moles of hydrogen gas = 0.039 moles
R = Gas constant =
T = Temperature =
Putting values in above equation, we get:
Hence, the pressure exerted by hydrogen gas is 0.33 atm