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Sebanyak 2,8 gram besi direaksikan dengan asam klo...

Sebanyak 2,8 gram besi direaksikan dengan asam klorida secukupnya menurut reaksi:

Fe open parentheses italic s close parentheses and 2 H Cl left parenthesis italic a italic q right parenthesis yields Fe Cl subscript 2 left parenthesis italic a italic q right parenthesis plus H subscript 2 open parentheses italic g close parentheses 

Tentukan massa Fe Cl subscript 2 yang dihasilkan (italic A subscript r Fe=56, Cl=35,5)

Jawaban:

Menentukan jumlah mol Fe:

table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript Fe end cell equals cell m over italic A subscript r end cell row blank equals cell fraction numerator 2 comma 8 over denominator 56 end fraction end cell row blank equals cell 0 comma 05 space mol end cell end table 

Menentukan massa Fe Cl subscript 2:

table attributes columnalign right center left columnspacing 0px end attributes row cell n subscript Fe Cl subscript 2 end subscript end cell equals cell fraction numerator Koef space Fe Cl subscript 2 over denominator Koef space Fe end fraction cross times n subscript Fe end cell row blank equals cell 1 over 1 cross times 0 comma 05 end cell row blank equals cell 0 comma 05 space mol end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell m subscript Fe Cl subscript 2 end subscript end cell equals cell n cross times italic M subscript r end cell row blank equals cell n cross times left parenthesis left parenthesis 1 cross times italic A subscript r space Fe right parenthesis plus left parenthesis 2 cross times italic A subscript r space Cl right parenthesis right parenthesis end cell row blank equals cell 0 comma 05 cross times left parenthesis left parenthesis 1 cross times 56 right parenthesis plus left parenthesis 2 cross times 35 comma 5 right parenthesis right parenthesis end cell row blank equals cell 0 comma 05 cross times 127 end cell row blank equals cell 6 comma 35 space gram end cell end table 

Jadi, massa Fe Cl subscript bold 2 yang dihasilkan adalah 6,35 gram.

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