Question

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Am nevoieeeeeeee urgentttttttt
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5

Answer 1

Răspuns:

MK=39g/mol

MH2O=2x1+16=18g/mol

MKOH=39+16+1=56g/mol

       2x18g....2x56g

2K + 2H2O   2KOH + H2↑

       7,2g...........xg

=7,2x2x56/2x18=22,4gKOH

calculam in moli

n=m/M=7,2/18=0,4moli

2moli......2moli

2K   +     2H2O   2KOH + H2↑

ymoi........0,4moli

y=0,4x2/2=0,4moli K

Explicație: