Answer :

To determine how many moles are in 135 liters of ammonia (NH₃) gas at standard temperature and pressure (STP), we can use the fact that at STP, one mole of any ideal gas occupies a volume of 22.414 liters.

Here are the steps to solve this problem:

1. Identify the volume of the gas: In this problem, the volume of ammonia gas is given as 135 liters.

2. Know the molar volume at STP: At standard temperature and pressure, one mole of a gas occupies 22.414 liters.

3. Calculate the number of moles: To find the number of moles, you divide the given volume of the gas by the molar volume at STP:

[tex]\[
\text{Number of moles} = \frac{\text{Volume of gas}}{\text{Molar volume at STP}}
\][/tex]

Substituting the given values,

[tex]\[
\text{Number of moles} = \frac{135 \, \text{L}}{22.414 \, \text{L/mol}}
\][/tex]

4. Result: The calculation gives us approximately 6.023 moles of ammonia.

So, there are approximately 6.023 moles in 135 liters of ammonia gas at STP.

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