What element has a mass of 32.8g and occupies 5.6l at stp?

At Standard Temperature and Pressure (STP), all gases have a volume of 22.4L/mol.

First, let's find the mole of the gas:
5.6L* (1mol/ 22.4L)= 0.25mol

Now, let's find the molar mass of the gas:
32.8g/ 0.25 mol= 131.2g/mol

Looking at the periodic table, the element is Xe.

Hope this would help~

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.