mK=39umH2=2u2K + 2H2O---->2KOH + H278g K ------ 2g H239g K ------- 1g H2x = 1g H2m=1gd=0,089g/dm3v=m/dv=1/0,089v = 11,2dm3 H2
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mK=39u
mH2=2u
2K + 2H2O---->2KOH + H2
78g K ------ 2g H2
39g K ------- 1g H2
x = 1g H2
m=1g
d=0,089g/dm3
v=m/d
v=1/0,089
v = 11,2dm3 H2