A 0.350-g sample of an acid, HX, requires 25.4 mL of a 0.140 M NaOH solution for complete reaction. Calculate the molar mass of the acid.
A) 98.4 g/mol
B) 121.3 g/mol
C) 42.3 g/mol
D) 68.4 g/mol
E) none of these

Question

Quizplus · Accepted Answer

The moles of NaOH used are 0.140 M * 0.0254 L = 0.003556 mol. Assuming a 1:1 reaction, moles of HX = moles of NaOH = 0.003556 mol. Molar mass = 0.350 g / 0.003556 mol = 98.4 g/mol.

A 0350-G Sample of an Acid, HX, Requires 25