What is the volume of hydrogen at a pressure of 1.06 atm if 200 cm3 of hydrogen is collected at a pressure of 1.00 atm?

Answer 1

You are given initial pressure and volume and are asked to calculate a different pressure.

P1V1 = P2V2

(200 cm3)(1.00 atm) = (1.06 atm)(V2)

V2 = 189 cm³

Answer 2

Hi Angel R.,

You would use the ideal gas law to consider your data:

pV = nRT

Since in the present case the value for n (number of moles of gas) didn't change, nor did the temperature, nor did R (it's a constant, it can't change, though its numeric value changes with the set of units used). So therefore, p and V are inversely related. So if you scale up the pressure from 1.00 atm to 1.06 atm (thereby squeezing it into a slightly smaller volume), that's a scale UP by 1.06 factor. So the volume will scale DOWN by a 1.06 factor (hint: try division).

-- Cheers, -- Mr. d.