Question

Am nevoie de raspuns complet!URGENT!!!!
Calculati compozitia procentuala masica a componentilor pentru :
a. un amestec de oxid de calciu si oxid de magneziu in raport molar de 1:2
b. un amestec de hidroxid de cupru si hidroxid de potasiu in raport molar 2:3 ;

Answer 1

a.
1.............2
CaO / MgO
Fie 3 moli amestec , 1 mol CaO si 2 moli MgO
masa amestec = (40+16 )× 1 + 2 × ( 24 + 16) = 56 + 80 = 136 g
c%CaO = 56/136 × 100 = 41.17%
=> c% MgO = 80/136 ×100 = 58.83%
b.
2...................3
Cu(OH)2 / KOH

Fie 5 moli amestec, 2 moli Cu (OH)2 si 3 moli KOH
masa amestec = 2 × (64 + 2 × 17) + 3 × (39 + 17) = 2 x 98 + 3 × 56 = 364 g
c% Cu ( OH)2 = 196/364 × 100 = 53.84%
c% KOH = 168/364 × 100 = 46.16%