Volume of a gas?

The question is

Given the mass of H calculated in #1 above, what volume would this gas occupy at 25degrees C and 755 mm Hg? At STP?

The mass calculated was .03g of Hydrogen.

Answer:
0.03 g of H2 occupies a certain volume at STP...

First, convert 0.03 g H2 to moles H2 (use the MW). Note this as n.
You are given P and T, you just calculated n, and you know R.
Use the Ideal Gas Law (PV = nRT) to solve for V, the volume.

Then use the combined Gas Law (P1V1/T1 = P2V2/T2) to solve for the V at STP, as long as you remember what STP is, correctly.

Easy as pie.
use PV=nRT

n = mass/ram
= 0.03 / 2

V=nRT/P

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