[Mayhem101]

Hi everyone, would someone be kind enough to walk me through these problems? I just don't know how to convert a given value in liters to grams.

1. What is the mass of argon gas in a 75.0 mL volume at STP?

2. A 27.6 mL sample of Ph3 (g) is obtained at STP.
a) What is the mass of this gas in milligrams?
b) How many molecules of PH3 are present? (Convert the grams in a) into moles and then multiply by 6.022 x 10^23?)

[Borek]

What is the mass of argon gas in a 75.0 mL volume at STP?

How many moles of the gas?

[Mayhem101]

What is the mass of argon gas in a 75.0 mL volume at STP?

How many moles of the gas?

It doesn't say.

[AWK]

Search Wikipedia for STP meaning.

[Borek]

So you have no idea what the question is about.

http://en.wikipedia.org/wiki/Ideal_gas_equation#Common_form

[Mayhem101]

So you have no idea what the question is about.

http://en.wikipedia.org/wiki/Ideal_gas_equation#Common_form

Oh crud...I realized what stupid and simple questions these are.

Thanks a lot Borek and AWK.