Question

A balloon is filled with 3.8 L of helium gas at STP. Approximately how many moles of helium are contained in the balloon?

Answer 1

Answer:

There 0.16964 moles of helium in 3.8 Liters of helium at STP.

Explanation:

Step 1: Identify the appropriate formula to apply.

Molar gas volume at stp is 22.4 Liters.

This means that : 1 mole of a Gas is equal to 22.4 Liters.

Step 2: identify the given volume of the gas.

In this case we have 3.8 Liters of helium.

Step 3: Apply the formula to get the answer.

1 mole —> 22.4 Liters

? —> 3.8 Liters.

By cross multiplication we have that :

3.8/22.4 × 1 = 0.16964 moles.

Step 4 : The answer.

There are 0.16964 moles of helium in 3.8 Liters of helium at STP.