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Suatu gas ideal bervolume 1,29 liter dan massanya ...

Suatu gas ideal bervolume 1,29 liter dan massanya 2,71 gram pada saat suhunya 18°C dan tekanannya 765 mmHg. Tentukanlah massa molekul gas ideal tersebut!

Jawaban:

Diketahui:

begin mathsize 14px style V equals 1 comma 29 space straight L equals 1 comma 29 cross times 10 to the power of negative 3 end exponent space straight m cubed m equals 2 comma 71 space gram T equals 18 degree straight C equals 291 space straight K P equals 765 space mmHg equals 1 comma 007 space atm R equals 8 comma 314 space straight J divided by mol. straight K end style  

Ditanya: Mr

Jawab:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell P V end cell equals cell n R T end cell row cell P V end cell equals cell fraction numerator m over denominator M r end fraction R T end cell row cell M r end cell equals cell fraction numerator m R T over denominator P V end fraction end cell row blank equals cell fraction numerator 2 comma 71 cross times 8 comma 314 cross times 291 over denominator 1 comma 007 cross times 10 to the power of 5 cross times 1 comma 29 cross times 10 to the power of negative 3 end exponent end fraction end cell row blank equals cell fraction numerator 6556 comma 50354 over denominator 129 comma 903 end fraction end cell row blank equals cell 50 comma 47 space gr divided by mol end cell end table end style 
    
Jadi, jawaban yang tepat adalah 50,47 gr/mol.

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