Sulfur and oxygen react to produce sulfur trioxide. In a ...

[tatyanajohnson]

Sulfur and oxygen react to produce sulfur trioxide. In a particular experiment, 7.9 grams of SO3 are produced by the reaction of 6.0 grams of O2 with 7.0 grams of S.
 
  What is the  yield of SO3 in this experiment? S (s) + O2 (g)  SO3 (g) (not balanced) A) 48
  B) 62
  C) 73
  D) 79
  E) 92

Question 2

A 25.0 mL sample of an HCl solution is titrated with a 0.139 M NaOH solution. The equivalence point is reached with 15.4 mL of base. The concentration of HCl is ________ M.
 
  A) 11.7
  B) 0.00214
  C) 0.0856
  D) 0.267
  E) 0.139

[bitingbit]

Answer to Question 1

D

Answer to Question 2

C

[tatyanajohnson]

Thanks for the timely response, appreciate it

[Dominic]

Wow, this really help