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H₂ + Cl₂ ---> 2HCl
22,4dm³ Cl₂ ------ 2*22,4dm³ HCl
15dm³ Cl₂ -------- xdm³ HCl
x = 30dm³ HCl
Zad 2)
M Mg(NO₂)₂=24+2*14+4*16=116g/mol
M Fe₂(SO₄)₃=2*56+3*32+12*16=400g/mol
M K₂CO₃=2*39+12+3*16=138g/mol
Zad 3)
mH₂O=18u
mCuO=80u
CuO + H₂ ---> Cu + H₂O
80g CuO-------18g H₂O
4g CuO---------xg H₂O
x = 0,9g H₂O