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Pemanasan 33,12 gram timbal(II) nitrat akan menghasilkan timbal oksida, nitrogen oksida, dan gas oksigen dengan persamaan reaksi: (Ar Pb = 207, N = 14, O = 16).   a. Setarakan persamaan reaksi tersebut! b. Hitung mol PbO, gas O2, NO2 yang dihasilkan. c. Tentukan massa PbO yang dihasilkan. d. Tentukan volum O2 pada STP. e. Tentukan jumlah molekul NO2.

Pertanyaan

Pemanasan 33,12 gram timbal(II) nitrat akan menghasilkan timbal oksida, nitrogen oksida, dan gas oksigen dengan persamaan reaksi: (Ar Pb = 207, N = 14, O = 16).

Pb open parentheses N O subscript 3 close parentheses subscript 2 left parenthesis italic s right parenthesis space rightwards arrow space Pb O open parentheses italic s close parentheses space plus space N O subscript 2 open parentheses italic g close parentheses space plus space O subscript 2 open parentheses italic g close parentheses 

a. Setarakan persamaan reaksi tersebut!
b. Hitung mol PbO, gas O2, NO2 yang dihasilkan.
c. Tentukan massa PbO yang dihasilkan.
d. Tentukan volum O2 pada STP.
e. Tentukan jumlah molekul NO2.

Pembahasan Soal:

a. Penyetaraan persamaan reaksi

Pb open parentheses N O subscript 3 close parentheses subscript 2 left parenthesis italic s right parenthesis space rightwards arrow space Pb O open parentheses italic s close parentheses space plus space 2 N O subscript 2 open parentheses italic g close parentheses space plus space 1 half O subscript 2 open parentheses italic g close parentheses 

b. mol produk yang dihasilkan

 table attributes columnalign right center left columnspacing 0px end attributes row cell n space Pb open parentheses N O subscript 3 close parentheses subscript 2 end cell equals cell fraction numerator gram over denominator Mr end fraction equals fraction numerator 33 comma 12 over denominator 207 plus 2 left parenthesis 14 right parenthesis plus 6 left parenthesis 16 right parenthesis end fraction end cell row blank equals cell 0 comma 1 space mol space end cell row blank blank blank row cell n space Pb O end cell equals cell fraction numerator koef space Pb O over denominator koef space Pb open parentheses N O subscript 3 close parentheses subscript 2 end fraction cross times n space Pb open parentheses N O subscript 3 close parentheses subscript 2 equals fraction numerator 1 over denominator 1 end fraction cross times 0 comma 1 end cell row blank equals cell 0 comma 1 space mol end cell row blank blank blank row cell n space N O subscript 2 end cell equals cell fraction numerator koef space N O subscript 2 over denominator koef space Pb open parentheses N O subscript 3 close parentheses subscript 2 end fraction cross times n space Pb open parentheses N O subscript 3 close parentheses subscript 2 end cell row blank equals cell 2 over 1 cross times 0 comma 1 end cell row blank equals cell 0 comma 2 space mol end cell row blank blank blank row cell n space O subscript 2 end cell equals cell fraction numerator koef space O subscript 2 over denominator koef space Pb open parentheses N O subscript 3 close parentheses subscript 2 end fraction cross times n space Pb open parentheses N O subscript 3 close parentheses subscript 2 end cell row blank equals cell fraction numerator 0 comma 5 over denominator 1 end fraction cross times 0 comma 1 end cell row blank equals cell 0 comma 05 space mol end cell end table 

c. massa PbO

table attributes columnalign right center left columnspacing 0px end attributes row massa equals cell mol cross times Mr end cell row blank equals cell 0 comma 1 space mol cross times left parenthesis 207 plus 16 right parenthesis end cell row blank equals cell 22 comma 3 space gram end cell end table 

d. volume oksigen

table attributes columnalign right center left columnspacing 0px end attributes row mol equals cell fraction numerator volume over denominator 22 comma 4 end fraction end cell row volume equals cell mol cross times 22 comma 4 L end cell row blank equals cell 0 comma 05 space mol space cross times 22 comma 4 end cell row blank equals cell 1 comma 12 space L end cell end table 

e. jumlah molekul NO2

table attributes columnalign right center left columnspacing 0px end attributes row mol equals cell fraction numerator N over denominator 6 comma 02 cross times 10 to the power of 23 end fraction end cell row N equals cell mol cross times 6 comma 02 cross times 10 to the power of 23 end cell row blank equals cell 0 comma 2 cross times 6 comma 02 cross times 10 to the power of 23 end cell row blank equals cell 1 comma 2 cross times 10 to the power of 23 end cell end table 

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 10 Juni 2021

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