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Question

Question #1

A 653 mL gas sample at STP is compressed to a volume of 188 mL, and the temperature is increased to 33 degrees celsius. What is the new pressure of the gas in Pa?

 

Question #2

What is the density of hydrogen sulfide (H2S) at 1.1 atm and 317 K?

Answer 1

you will set up two conditions:

 

STP (condition 1): v= 653 mL,  T= 273 K, P= 1 atm

New condition (condition 2): V= 188 mL, T=273+33= 306 K, p=?

According to PV =nRT, n is constant, so it will be rearranged to P₁V₁/T₁ = P₂V₂/T₂

so plug in, it become  (1)(653)/273 = (P2)(188)/306

so P2 = 3.89  atm