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y-masa tlenku miedzi(II)=3,5-x
z1,z2=masy pary
x z1
Cu2O + H2= H2O + 2Cu
144 17
3,5-x z2
Cu0 + H2= H20 + Cu
80 17
z1=17x/144=0,12x
z2=17(3,5-x)/80=0,74-0,21x
z1+z2=0,74-0,09x
0,588=0,740,09x
0,09x=0,152
x=1,69g
y=3,5-x=1,81
dalej se poradzisz