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Răspuns :

Răspuns:

MNa2O=2×23+16=62g/mol

MH2S=2×1+32=34g/mol

62g........34g

Na2O + H2S => Na2S + H2O

xg.............68g

x=68×62/34=calculează

calculam în moli

nH2S=m/M=68/34=2moli

1mol........1mol

Na2O + H2S => Na2S + H2O

ymoli........2moli

y=2×1/1=2moli Na2O