[fminton]

I am trying to help a student, but I do not know too much about chemistry.  I know that I need to use pv=NRT formula for this problem, but would like to have it spelled out for me so that I can help my student.

Xenon hexafluoride was one of the first noble gas compounds synthesized.  The solid reacts rapidly with the silicon dioxide in glass or quartz containers to form liquid XeOF4 (4 is small) and gaseous silicon tetrafluoride.
What is the pressure in a 1.00-L container at 25degrees C after 2.00g of xenonhexafluoride reacts? (Assume that silicon tetrafluoride is the only gas present and that it occupies the entire volume.)

Thank you for your assistance. The more explaining that you can do, the better.

[Dan]

What is the pressure in a 1.00-L container at 25degrees C after 2.00g of xenonhexafluoride reacts?

reacts with what?

[Bakegaku]

Start out by balancing the equation

SiO₂ + XeF₆-> XFO₄ + SiF₄

You are trying to solve for p, so you need the other variables

V is given as the volume of the container: 1.00 L

n is the number of moles of gas.  You calculate molar mass by adding up the atomic masses of the elements in the compound (found on most periodic tables).  Find this number for XeF₆ then divide 2.00 by this number to get the number moles of Xenon hexafluoride.  Then you can use the balanced equation to find how many moles of Silicon hexafluoride you produced.

R is a constant you should be able to find in any chemistry book or on a website (I don't have it memorized, unfortunately  )

T is 25+273=298K

Once you find all those it's simple algebra to figure out.

Now, I'm not sure what you mean by not knowing too much, so if you have trouble balancing the equations or understanding anything else I mentioned (especially in finding n) then don't be afraid to ask.

[Borek]

SiO₂ + XeF₆-> XFO₄ + SiF₆

Since when silicon tetrafluoride formula is SiF₄?

But even with SiF₄ this reaction can't be balanced.

fminton: please check the product formula, is it XeFO₄ or XeOF₄?

[Dan]

Xenon hexafluoride was one of the first noble gas compounds synthesized.  The solid reacts rapidly with the silicon dioxide in glass or quartz containers to form liquid XeOF4 (4 is small) and gaseous silicon tetrafluoride.

so

2XeF₆ + SiO₂ --> 2XeOF₄ + SiF₄

[AWK]

According to stoichiometry and Avogadro law the pressure will be the same as that of 1 g fo XeF6
pV=mRT/M
where n=m/M (moles equal to mass divided by a molecular mass)