Расставьте коэффициенты в уравнениях химических реакций:
а) $C + H_{2} → CH_{4}$
б) $Zn + HCl → ZnCl_{2} + H_{2}$
в) $S + O_{2} → SO_{2}$
г) $Na_{2}O + H_{2}O → NaOH$
д) $NaOH + H_{2}SO_{4} → Na_{2}SO_{4} + H_{2}O$
$C + 2H_{2} = CH_{4}$
$Zn + 2HCl = ZnCl_{2} + H_{2}$
$S + O_{2} = SO_{2}$
$Na_{2}O + H_{2}O = 2NaOH$
$2NaOH + H_{2}SO_{4} = Na_{2}SO_{4} + 2H_{2}O$
