A 0.2600 g sample of an unknown acid requires 28.22 mL of 0.1199 M NaOH for neutralization to a phenolphthalein end point. What is the molar mass of the unknown acid?
a) 47.5 g/mol
b) 101.3 g/mol
c) 134.2 g/mol
d) 250.6 g/mol