Calculate the Percent Ionization of Nitrous Acid in a Solution $4.50 \times 10 ^ { - 4 }$

Multiple Choice

Calculate the percent ionization of nitrous acid in a solution that is 0.249 mol L^-1 in nitrous acid.The acid dissociation constant of nitrous acid is $4.50 \times 10 ^ { - 4 }$

A) 5.53 %
B) 0.0425 %
C) 1.12 × $10 ^ { - 4 }$ %
D) 4.25 %
E) 0.0450 %