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Ce cantitate de oxid de potasiu in grame si moli se obtine in urma arderii a 78g potasiu.Ce cantitate in grame si moli se consuma?...Dau coroana va rogg!!

Răspuns :

2 K + 1/2 O2 = K2O
M K = 39 g/mol
M K2O = 94 g/mol
2*39 g K.........94 g K2O
78 g K.................x
x = 94 g K2O