$1.$ How much ammonia $($NH$)$ is required to produce $200$ kg of ammonium sulphate $(($NH$)$SO$),$ assuming the reaction has a $90\%$ yield?

$2.$ A farmer wants to lower the pH of his soil using ammonium chloride $($NH$$Cl$).$ If he needs to apply $50$ kg of NH$$Cl per hectare, how much chloride $($Cl$)$ is added to the soil in kg$?$