A sample of hydrogen gas collected at STP occupies 181mL. The gas is heated to 25degree Celsius and is found to occupy 200mL.what is its new pressure in mm Hg?

1 Answer
Udhaya S.
Apr 22, 2018

PV = nRT

Explanation:

V_(H_2) = 181 * 10^(-6) = 0.000181 m^3
My definition of s.t.p is 100000 Pa and 273K. It could be different from your values so caution here.
PV = nRT

(100000)(0.000181) = n(8.31)(273)

n = 0.00798 mol

Since moles do not change, we use this as the new constant and apply PV = nRT again in new conditions.

(P)(0.0002) = (0.00798)(8.31)(298)

P = 98800 Pa or P = 0.975 atm

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