What is the density of 400 ml of gas that weighs .75 g at STP

urrrggg.... i have a chem test tomorrow, and i dont understand anything! pleas help! thanks

The unit of density for a gas is g per L

0.75 g / 0.400 L = 1.875 g/L

to two significant figures, this is 1.9 g/L

Good luck on the test.

Here's my materials on gas-related matters:

http://www.chemteam.info/GasLaw/KMT-Gas-…

Hopefully, you will find some assistance there.

density =mass/volume
mass=0.75g
vol=400 mL = 0.4 L

d= 0.75/0.4 answer will be in g/L and will be at STP