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Determină compozitia procentuala a NH3,a H2O,a Al2O3.
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Răspuns :

NH3
M = 17g/mol
%N = 14/17 * 100 = 82,35%
%H = 3/17 * 100 = 17,64%
H2O
M = 18 g/mol
%H = 2/18 * 100 = 11,11%
%O = 16/18 * 100 = 88,88%
Al2O3
M Al2O3 = 102 g/mol
%Al = 2*27/102 * 100 = 52,94%
%O = 3*16/102 = 47,05%