× , e The Freezing Port Of Benzem x e l.) Average Number Of Moles Jazmine rm Onl

Question

× , e The Freezing Port Of Benzem x e l.) Average Number Of Moles Jazmine rm Online Ex: x https://farmu.blackboard.com/webapps assessment take/launch sp ?course assessment d' 78 Remaining Time: 1 hour, 52 minutes, 46 seconds. Question Completion Status: Path: p words:0 10 points Save Answer Question 3 What is the mass of an unknown sample made of KHP and some impurities, who's percent composition of KHP is 83% if the it took 15 mL of 0.4M NaOH solution to neutralize the sample in 40 mL of water? Align Center Path: p Words:0 10 points Save Answer 11:30 p Lights Out (Rest is critical for full 8 F1O F4 F5 F6 F7 F8 F9

Explanation / Answer

Reaction:

KHP + NaOH ------> KNaP + H2O

So, one mole of NaOH required to neutralize one mole of KHP.

MOles of KHP = moles of NaOH

                        = Volume of NaOH x molarity of NaOH

                        = 15 mL x 0.4 M

                        = 6 mmol

                       = 0.006 mol

Mass of KHP = moles of KHP x molar mass of KHP

                     = 0.006 mol x (204.22 g/mol)

                     = 1.23 g

% KHP = ( mass of KHP/mass of unknown sample) x 100

Mass of unknown sample = ( mass of KHP/% KHP) x 100

                                          = (1.23 g/83%)x100

                                         = 1.48 g

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