We’re being asked to **calculate the volume** occupied by **56.5 g argon gas** at **standard temperature and pressure**.

Recall that ** standard temperature and pressure (STP)** is defined as 1 atm and 0 ˚C.

**For this problem, we need to do the following:**

*Step 1:* Calculate the moles of Ar.

*Step 2:* Calculate the volume using the ideal gas law.

Calculate the volume occupied by 56.5 g of argon gas at STP.

a) 22.4 L

b) 31.7 L

c) 34.6 L

d) 1, 270 L

e) 1, 380 L

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Based on our data, we think this problem is relevant for Professor Altomare's class at UCF.