A buffer solution with a pH of 4.78 is prepared with ________ M ...

[jerry coleman]

A buffer solution with a pH of 4.78 is prepared with ________ M formic acid and 0.90 M sodium formate. The Ka of formic acid is 1.8  10-4.
 
  A) 0.083
  B) 0.17
  C) 3.3  103
  D) 9.8
  E) 0.041

Question 2

The value of G at 25 C for the oxidation of solid elemental sulfur to gaseous sulfur dioxide, S (s, rhombic) + O2(g)  SO2 (g) is ________ kJ/mol.
 
  A) +395.2
  B) +269.9
  C) -269.9
  D) +300.4
  E) -300.4

Question 3

In the Bohr model of the atom, ________.
 
  A) electrons travel in circular paths called orbitals
  B) electrons can have any energy
  C) electron energies are quantized
  D) electron paths are controlled by probability
  E) both A and C

[micaelaswann]

Answer to Question 1

A

Answer to Question 2

E

Answer to Question 3

C