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Dalam suatu ruangan 2 liter dicampurkan 0,5 mol ga...

Dalam suatu ruangan 2 liter dicampurkan 0,5 mol gas HCI dan 0,4 mol oksigen Kemudian dipanaskan pada suhu 200°C. setelah 20 detik, terbentuk 0,1 mol begin mathsize 14px style Cl subscript 2 end style menurut persamaan reaksi: space  

begin mathsize 14px style 4 H Cl italic open parentheses italic g italic close parentheses space space plus space space O subscript 2 italic open parentheses italic g italic close parentheses space space rightwards arrow space space 2 H subscript 2 O italic open parentheses italic g italic close parentheses space space plus space space 2 Cl subscript 2 italic open parentheses italic g italic close parentheses end style 
Hitunglah laju reaksi dari masing-masing pereaksi dan hasil reaksi :space  

  

begin mathsize 14px style V subscript HCl space equals space fraction numerator negative sign increment open vertical bar H Cl close vertical bar over denominator increment t end fraction end style = . . .   

begin mathsize 14px style V subscript O subscript 2 end subscript space equals space fraction numerator negative sign increment open vertical bar O subscript 2 close vertical bar over denominator increment t end fraction end style= . . .space  

begin mathsize 14px style V subscript H subscript 2 O end subscript space equals space fraction numerator negative sign increment open vertical bar H subscript 2 O close vertical bar over denominator increment t end fraction end style= . . . space  

begin mathsize 14px style V subscript Cl subscript 2 end subscript space equals space fraction numerator negative sign increment open vertical bar Cl subscript 2 close vertical bar over denominator increment t end fraction end style 

 

  1. . . . space 

  2. . . . space 

Jawaban:

Pertama, tentukan mol mula - mula :

Mol mula - mula begin mathsize 14px style H Cl end style = 0,5 mol

Mol mula - mula begin mathsize 14px style O subscript 2 end style = 0,4 mol

Menurut soal di atas, reaksinya dapat dituliskan seperti persamaan di bawah ini.

Terlebih dahulu, kita menentukan nilai x,y, dan z mol zat terurai melalui mol begin mathsize 14px style Cl subscript 2 end style yang sudah diketahui.  

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank x end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank mol end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell H Cl end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bevelled fraction numerator koef point space H Cl over denominator koef point space Cl subscript 2 cross times mol space Cl subscript 2 end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table space space table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bevelled 4 over 2 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank mol end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 0 comma 2 space mol space... left parenthesis 1 right parenthesis end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank mol end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank O end table subscript 2 table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bevelled fraction numerator koef point space O subscript 2 over denominator koef point space Cl subscript 2 cross times mol space Cl subscript 2 end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank blank end table space space table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bevelled 1 half end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank mol end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 0 comma 05 space mol space... left parenthesis 2 right parenthesis end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank z end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank mol end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank H end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell blank subscript 2 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank O end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bevelled fraction numerator koef point space O subscript 2 over denominator koef point space Cl subscript 2 cross times mol space Cl subscript 2 end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank blank end table space space table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bevelled 2 over 2 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cross times end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 1 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank mol end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 0 comma 1 space mol space... left parenthesis 3 right parenthesis end cell end table end style 

Laju reaksi didefinisikan sebagai perubahan konsentrasi di terhadap waktu, sehingga berlaku persamaan laju reaksi sebagai begin mathsize 14px style V space equals space fraction numerator negative sign increment open vertical bar M close vertical bar over denominator increment t end fraction end style untuk reaktan dan begin mathsize 14px style V space equals space fraction numerator plus increment open vertical bar M close vertical bar over denominator increment t end fraction end style untuk produk. Perubahan konsentrasi merupakan selisih antara hasil akhir reaksi dan mula-mula, sehingga perubahan konsentrasi didefinisikan sebagai zat yang terurai (x,y, dan z mol per volume). Selanjutnya. masing-masing mol zat terurai dibagi dengan volume ruangan (2 liter) untuk mendapatkan konsentrasi zat tersebut. Jadi, konsentrasi x,y,z dan begin mathsize 14px style Cl subscript 2 end stylemasing-masing adalah 0,1 M; 0,025 M; 0,05 M dan 0,05 M, sehingga laju reaksi dapat dihitung melalui persamaan di bawah ini : 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell V subscript HCl end cell end table space table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator negative sign increment open vertical bar H Cl close vertical bar over denominator increment t end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank blank row blank blank blank end table space space space space space space space equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator 0 comma 1 over denominator 20 end fraction end cell end table space space space space space space space equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 005 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank M end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank forward slash end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank detik end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank V end table subscript O subscript 2 end subscript equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator negative sign increment open vertical bar O subscript 2 close vertical bar over denominator increment t end fraction end cell end table space space space space space space space equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator 0 comma 025 over denominator 20 end fraction end cell end table space space space space space space space equals 0 table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 00125 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank M end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank forward slash end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank detik end table end style  

begin mathsize 14px style V subscript H subscript 2 O end subscript equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator plus increment open vertical bar H subscript 2 O close vertical bar over denominator increment t end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator 0 comma 05 over denominator 20 end fraction end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 0025 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank M end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank forward slash end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank detik end table end style  

begin mathsize 14px style V subscript Cl subscript 2 end subscript space equals space fraction numerator plus increment open vertical bar Cl subscript 2 close vertical bar over denominator increment t end fraction space space space space space space space equals fraction numerator 0 comma 05 over denominator 20 end fraction space space space space space space space equals 0 comma 0025 space M forward slash detik end style

Jadi, begin mathsize 14px style V subscript HCl comma space V subscript O subscript 2 end subscript comma space V subscript H subscript 2 O end subscript space dan space V subscript Cl subscript 2 end subscript end style masing-masing adalah 0,005 M/detik, 0,00125 M/detik, 0,0025 M/detik, dan 0,0025 M/detik.

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