na1shircaSamuspugla na1shircaSamuspugla

25-07-2016
Chemistry

Answered

Estimate the heat of neutralization of H3PO4 in kJ/mol given these data: Heat transferred = 2.2 x 102 J Moles of H3PO4 = 1.5 x 10−3 mol Moles of NaOH = 5.0 x 10−3 mol

Verified Answer :

Hussain514 Hussain514

29-07-2016

write out the balance equation
3NaOh+H3PO4->Na3PO4+3H2O
You are given everything needed to calculate
q=heat transfer=2.210^2,
H3PO4 moles= 1.510^-3,
NaOH moles=5.010^-3
equation is deltaHneutraliztion=q/Moles of limiting reagent
H3PO4 is limiting reagent because lowest moles, and is used up first
Now plug in variables

DeltaH=2.210^2(1.5*10^3)= 146.67kj/mole

Notice we had to convert J to kj,

Answer Link

meerkat18 meerkat18

31-07-2016

1.) write out the balance equation
3NaOh+H3PO4->Na3PO4+3H2O

2.) You are given everything needed to calculate
q=heat transfer=2.210^2, H3PO4 moles= 1.510^-3, NaOH moles=5.010^-3

3.) equation is deltaHneutraliztion=q/Moles of limiting reagent
H3PO4 is limiting reagent because lowest moles, and is used up first

4.) Now plug in variables
DeltaH=2.210^2(1.5*10^3)= 146.67kj/mole
Notice we had to convert J to kj,

Answer Link

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