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| Learn: psychology Tinal I Quiz et Classical Study Music | Mozart OWLv2 I Onine teaching and learnin..+ Week 15: Review Questions Question 11 pt Question 2 Question 3 Question 4 A 4.35-g sample of a diprotic acid requires 116.0 mL of a 0.750 M NaOH solution for complete n Determine the molar mass of the acid. mol Submit Answer Try Another Version 5 item attempts remalning Question 5 Question 1 pt Progress: 1/6 items Due Dec 7 at 11:55 PM PreviousNext Finish Assignment Email Instructor Save and Exit Cengage Learning | Cengage Technical Support

Explanation / Answer

Balanced chemical equation is:
2 NaOH + H2A ---> Na2A + 2 H2O

lets calculate the mol of NaOH
volume , V = 116.0 mL
= 0.116 L


use:
number of mol,
n = Molarity * Volume
= 0.75*0.116
= 8.7*10^-2 mol
According to balanced equation
mol of H2A reacted = (1/2)* moles of NaOH
= (1/2)*8.7*10^-2
= 4.35*10^-2 mol
This is number of moles of H2A

mass(H2A)= 4.35 g


use:
number of mol = mass / molar mass
4.35*10^-2 mol = (4.35 g)/molar mass
molar mass = 100 g/mol
Answer: 100 g/mol

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