Use Henry's law to determine the molar solubility of helium at a pressure of 1.5 atm and 25 degrees celsius .

this is what I know...
Sgas = kH x Pgas

so then I plugged in...
Sgas = 3.7 x 10-4 x 1.5

my answer was .055 and it is wrong.
could someone please help show me what I am doing wrong.

3 answers

My first reaction is what form of Henry's law are you using? What are the units of your Henry's Law constant?

http://en.wikipedia.org/wiki/Henry%27s_law
for sgas moles/liter and pgas m/atm
redo calculations...
(3.7*10^-4)*1.5=5.7*10^-4