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pV=nRT
n=pV/RT
n=p*V1/RT1=p*V2/RT2
V1=T1*V2/T2
V1=273,15*38,28/373,15=28dm³ <--- szukane V
x-l moli CH₄
y-l moli C₃H₈
{x+y=16,8
{x+3y=28
x=16,8-y
16,8+2y=28
{y=5,6dm³
{x=11,2dm³
%C₃H₈=5,6dm³*100%/16,8dm³=33,33%