Homework Answers
Zn(s) +2HCl(aq) ---------> ZnCl2(aq) + H2(g)
mass of solution = volume *density
= 50*1 = 50g
q = mc
T
= 50*4.18*(23.7-22.5)
= 250.8J
q =
H = 250.8J = 0.2508KJ
no of moles of Zn = mass of Zn/gram atomic mass
= 0.115/65.4
= 0.00176moles
H
= 0.2508KJ/0.00176mole = 142.5KJ/mole
a.
mass of Zn = 0.115g
H
= 0.2508KJ/0.115g = 2.18KJ/g
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