Number of moles of HCl and NaOH added
= 1000
MV
= 1/1000×50
=0.05
Mass of mixture =V×d=100×=100g
Heat evolved, q=msΔT=100×4.18×(27.5−21.0)
=100×4.18×6.5J=2717J=2.717 kJ
(b) The involved reaction is:
HCl(aq.)+NaOH(aq.)→NaCl(aq.)+H2O
ΔH= Heat evolved per mol
= 0.05−2.717
=−54.34 kJ
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