December 23, 2024, 01:48:36 PM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Gas Law Lab----Help  (Read 4461 times)

0 Members and 1 Guest are viewing this topic.

Offline sillygirl

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
Gas Law Lab----Help
« on: May 21, 2009, 10:16:12 PM »
How do you do this question, I can not come up with the answer:

Find the mass in grams of a 240 ml sample of dry air at a pressure of 750 mmHg and a temperature of 19 degrees celsius. 
Logged

Offline Acid_Guru

  • Regular Member
  • ***
  • Posts: 24
  • Mole Snacks: +0/-3
Re: Gas Law Lab----Help
« Reply #1 on: May 21, 2009, 11:00:58 PM »
Use PV=NRT, so you get ((750/760)*(240/1000))=    N
                                 --------------------
                                      (.0821*292)

Find N

Then N*28.97(molar mass of air) is your answer, I got 0.286 grams (3 significant figures) for my answer.
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links