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Campuran gas metana () dengan butena () sebanyak 2...

Campuran gas metana (begin mathsize 14px style C H subscript 4 end style) dengan butena (begin mathsize 14px style C subscript 4 H subscript 8 end style) sebanyak 20 mL dibakar sehingga dihasilkan 29 mL gas begin mathsize 14px style C O subscript 2 end style. Tentukan volume gas begin mathsize 14px style C H subscript 4 end style  dan begin mathsize 14px style C subscript 4 H subscript 8 end style yang bereaksi.

Jawaban:

Misalnya, volume metana sebesar x mL, maka volume butena sebesar (20 - x) mL. Tentukan volume gas karbon dioksida yang dihasilkan dari masing-masing reaksi:
 

begin mathsize 14px style C H subscript 4 and 2 O subscript 2 yields C O subscript 2 and 2 H subscript 2 O end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V space C O subscript 2 end cell equals cell fraction numerator koefisien space C O subscript 2 over denominator koefisien space C H subscript 4 end fraction cross times V space C H subscript 4 end cell row blank equals cell 1 over 1 cross times x space mL end cell row blank equals cell x space mL end cell end table end style 


begin mathsize 14px style C subscript 4 H subscript 8 and 6 O subscript 2 yields 4 C O subscript 2 and 4 H subscript 2 O end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V space C O subscript 2 end cell equals cell fraction numerator koefisien space C O subscript 2 over denominator koefisien space C subscript 4 H subscript 8 end fraction cross times V space C subscript 4 H subscript 8 end cell row blank equals cell 4 over 1 cross times left parenthesis 20 minus sign x right parenthesis space mL end cell row blank equals cell 80 minus sign 4 x space mL end cell end table end style 


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell V space C O subscript 2 space total space end cell equals cell x plus left parenthesis 80 minus sign 4 x right parenthesis end cell row 29 equals cell 80 minus sign 3 x end cell row cell 3 x end cell equals cell 80 minus sign 29 end cell row cell 3 x end cell equals 51 row x equals cell 51 over 3 end cell row x equals cell 17 space mL end cell end table end style 


begin mathsize 14px style V space C H subscript 4 double bond x equals 17 space mL V space C subscript 4 H subscript 8 equals 20 minus sign x equals 20 minus sign 17 equals 3 space mL end style 


Jadi, volume metana sebesar 17 mL dan volume butena sebesar 3 mL.

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