Jawabanmu

2014-06-16T14:44:55+07:00
1. Zn + 2 HCl --> ZnCl2 + H2
18. n O2 = m/Mr = 8/2.16 = 8/32 = 0.25 mol
n1/n2 = v1/v2
n1/0.25 = 15/2.5
n1 = 1.5 (H2)
n X = koef. X/koef H2 x n1 = 1/2 x 1.5 = 0.75
Ar X = m/n = 36/0.75 = 48

19. n N2 = m/Mr = 0.7/2.14 = 0.7/28 = 0.025
n1/n2 = v1/v2
n1/0.025 = 0.6/0.5
n1 = 0.03 (O2)
n KClO3 = koef. KClO3/koef O2 x n1 = 2/3 x 0.03 = 0.02
Mr = K + Cl + 3O = 122.5
m = n.Mr = 0.02x122.5 = 2.45 g