вычеслите масу 4,2 моль PH3
m(PH3)=4.2*34=142.8грамм
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kolichestvo veshestva = massa/ Molyarnuyu massu znachit, m=34 * 4.2=142.8
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m(PH3)=4.2*34=142.8грамм
....................................
kolichestvo veshestva = massa/ Molyarnuyu massu znachit, m=34 * 4.2=142.8