if 25 Liters of H2 is reacted with excess chlorine gas ( Cl2 ), how many grams of HCl can be produced?

To find the number of grams of HCl that can be produced when 25 liters of H2 reacts with excess chlorine gas (Cl2), we need to follow a series of steps:

Step 1: Write a balanced chemical equation:
2H2 (g) + Cl2 (g) → 2HCl (g)

This equation shows that two moles of hydrogen gas (H2) react with one mole of chlorine gas (Cl2) to produce two moles of hydrogen chloride (HCl).

Step 2: Calculate the number of moles of H2:
To convert the volume of H2 (given in liters) to moles, we need to use the ideal gas law:
PV = nRT

Where:
P = pressure (assumed to be constant)
V = volume of H2 (25 liters)
n = number of moles of H2 (unknown)
R = ideal gas constant
T = temperature (assumed to be constant)

Since the pressure, ideal gas constant, and temperature are assumed to be constant, we can rearrange the equation as follows:
n = PV / RT

Now, substitute the given values:
P = 1 atm (assuming atmospheric pressure)
V = 25 liters
R = 0.0821 L atm/mol K (ideal gas constant)
T = temperature (not given)

Step 3: Determine the number of moles of H2:
Substitute the values into the equation:
n = (1 atm * 25 L) / (0.0821 L atm/mol K * T)

Step 4: Calculate the number of moles of HCl produced:
From the balanced equation, 2 moles of H2 react to produce 2 moles of HCl. Therefore, the number of moles of HCl produced is the same as the number of moles of H2.

Step 5: Convert moles of HCl to grams:
To convert the moles of HCl to grams, we need to use the molar mass of HCl. The molar mass of HCl is approximately 36.46 g/mol.

Multiply the number of moles of HCl by the molar mass:
Mass = moles * molar mass

In this case, the number of moles of HCl is equal to the number of moles of H2.

So, to summarize, you need to calculate the number of moles of H2 using the ideal gas law. Then, convert this calculated value to grams of HCl using the molar mass of HCl.