A sample of N2 gas (2.0 mmol) effused through a pinhole in 5.5 s. ...

[abern]

A sample of N2 gas (2.0 mmol) effused through a pinhole in 5.5 s. It will take ________ s for the same amount of CH4 to effuse under the same conditions.
 
  A) 7.3
  B) 5.5
  C) 3.1
  D) 4.2
  E) 9.6

Question 2

How many milliliters of 0.260 M Na2S are needed to react with 25.00 mL of 0.315 M AgNO3? Na2S(aq) + 2 AgNO3(aq)  2 NaNO3(aq) + Ag2S(s)
 
  A) 15.1 mL
  B) 30.3 mL
  C) 41.3 mL
  D) 60.6 mL

Question 3

How many grams of H3PO4 are in 145 mL of a 3.50 M solution of H3PO4?
 
  A) 0.508
  B) 49.7
  C) 20.0
  D) 4.90
  E) 612

[LP]

Answer to Question 1

D

Answer to Question 2

A

Answer to Question 3

B

[abern]

Excellent

[ricroger]

Great answer, keep it coming