1/
$n_{CH_4}=1,6/16=0,1mol$
$a/CH_4+2O_2\overset{t^o}\to CO_2+2H_2O$
b/Theo pt :
$n_{CO_2}=n_{CH_4}=0,1mol$
$⇒V_{CO_2}=0,1.22,4=2,24l$
2/
$n_{Na}=2,3/23=0,1mol$
$a/4Na+O_2\overset{t^o}\to 2Na_2O$
b/Theo pt :
$n_{Na_2O}=1/2.n_{Na}=1/2.0,1=0,05mol$
$⇒m_{Na_2O}=0,05.62=3,1g$
$n_{O_2}=1/4.n_{Na}=1/4.0,1=0,025mol$
$⇒V_{kk}=0,025.22,4.5=2,8l$