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2014-07-04T20:08:37+03:00
Zn + 2 HCl ---> ZnCl2 + H2
65 g zinc......2 g hidrogen
97,5 g zinc.......x g hidrogen          x = 3 g hidrogen
CuO + H2 ---> CuO
80 g CuO.......2 g H2
y g CuO.........3 g H2       y = 120 g CuO
puritatea=masa pura/masa impura * 100 = 120/180 * 100 = 66,66 %
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