C-CH4-CO2-BACO3-BA(NO3)2 -BACO3

mg + 2hcl = mgcl2 + h2

0,9*29=26,1

1,5/26,1=0,5/8,7

0,5*22,4/8,7=1,287356

fe↦feo↦feso4

2fe+o₂⇒feo

feo+h₂so₄⇒feso₄+h₂o 

ch3-ch(ch3)-ch2-ch2-ch3

ch2=ch-ch(ch3)-ch2-ch3

  ch-=c-ch(ch3)-ch2-ch3

ch3-c6h5