The pH of a solution with H3O+ = 5.9 10-3 M, to the correct ...

[sammy]

The pH of a solution with H3O+ = 5.9  10-3 M, to the correct number of significant figures, is ________.
 
  A) 5.9  10-3
  B) 2.2
  C) 2.23
  D) 1.01
  E) 2.229

Question 2

The correct order for filling orbitals with electrons is ________.
 
  A) 1s, 2s, 2p, 3s, 3d, 4s, 3p
  B) 1s, 2s, 3s, 4s, 2p, 3p, 3d
  C) 1s, 2s, 2p, 3s, 3p, 4s, 3d
  D) 1s, 2s, 3d, 2p, 3p, 3s, 4s

[allisonblackmore]

Answer to Question 1

C

Answer to Question 2

C

[sammy]

Excellent

[xiaomengxian]

Wow, this really help