Hola estos problemas consisten inicialmente en calcular la masa de c/ compuesto en el primer caso: a) NH4NO2 el nitrogeno es 14g/mol el hidrogeno es 1g/mol y el oxigeno es 16g/mol sumando esto por el subindice que indica el numero de atomos del elemento en el compuesto 14*2+16*2+4=64 luego tienes esto 0.055mol*64g/1mol=3.52g b) lo mismo H2 SO4 H tiene 1g/mol S 32g/mol y O 16g/mol de tal forma 2+32+4*16=98 0.07mol*98g/mol=6.86g y la ultima c) Al tiene 27g/mol y Cl 35.5g/mol por lo q 27+35.5*3=133.5 con esto 5.23mol*133.5g/mol=698.205g ahora para sacar todos estos resultados me base en una sola formula n=m/PM.
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