Thanks gravenewworld, Many thanks to you.
I apreciate the help and I hope that the Lord bless you with many good things. Your suggestion was perfect and the anwer I came up with was right. Thanks a bunch..
A toy balloon if filled with 0.150 grams of hellium and ocupied a valume of 4250.0 Cm3. It rises 2500 miters above the street where temperature is 23 degrees F. Calculate the pressure that the hellium exert inside the balloon at this altitud.
Please anyone who can help me. I thing I have to...