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4.determinati masa molara pentruurmatoarele substante:

a)Hidroxid de aluminiu………………b)sulfat de aluminiu

……………………………………………………………………………………………………………………………………………………………………………………………

…………………………………………………………………………………………….

5.Determinati compozitia procentuala de masa pentru substantele:

a)acid sulfuric…………………… b)oxid de fier……………………………

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

Question

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Pokju8888id Pokju8888id · Answer 1

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Explicație:

MAl(OH)3= AAl + 3.16 + 3AH

=27 + 48 +3

=78--------> 78g/moli

MAl2(SO4)3= 2.27 + 3.32 + 12.16

=54 + 96 +192

=342 ------> 342g/moli

5.

H2SO4

M= 2+32 +4.16=98------> 98g/moli

98g H2SO4----------2gH--------32g S-------64g O

100g------------------------x-----------y------------------z

x=100 . 2 : 98=2,04%H

y=100 . 32 : 98=32,65% S

z=100 .64 : 98=65,31%O

Fe2O3

M=2.56+ 3.16=160-------> 160g/moli

160g Fe2O3----------112g Fe---------48gO

100g----------------------X----------------------Y

X= 100.112 : 160=70% Fe

Y= 100 .48 : 160=30% O