A sample of gas (1.9 mol) is in a flask at 21 C and 697 mm Hg. ...

[Deast7027]

A sample of gas (1.9 mol) is in a flask at 21 C and 697 mm Hg. The flask is opened and more gas is added to the flask. The new pressure is 841 mm Hg and the temperature is now 26 C. There are now ________ mol of gas in the flask.
 
  A) 1.6
  B) 2.3
  C) 2.9
  D) 3.5
  E) 0.28

Question 2

Combustion analysis of an unknown compound containing only carbon and hydrogen produced 4.554 g of CO2 and 2.322 g of H2O. What is the empirical formula of the compound?
 
  A) CH2
  B) C2H5
  C) C4H10
  D) C5H2

[dawsa925]

Answer to Question 1

B

Answer to Question 2

B