I had this question on my chemistry assignment:

A 250 mL sample of gaseous hydrogen bromide, measured at 23.7°C and .945 atm, was dissolved in sufficient pure water to form 250 mL of solution. What was the pH of the solution?

So I used PV=nRT to solve for n

(.945*.25)/(.0821*296.85)

n=.00969

This is where I'm unsure:

.00969/.250=.03877

-log[.03877]= 1.411

Should n be divided by 250 mL or is it a different number?