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MCH4 - 12 + 4*1 = 16 g/mol
22,4 dm³ CH4 - 16 g/mol CH4
2,24 dm³ CH4 - x g/mol CH4
x= 1,6 g -> masa próbki metanu.
Zadanie 2
H2SO4 -> cząsteczka kwasu siarkowego (VI)
MH2SO4 = 2*1 + 32 + 4*16 = 2(masa wodoru) + 32(masa siarki) + 64(masa tlenu) = 98 g/mol (masa cząsteczko kawsu)
%wodoru = 2g*100%*/98g = 2,04%
%siarki = 32g*100%/98g = 32,65%
%tlenu = 64g*100%/98g = 65,31%
pozdrawiam ;)