When hydrochloric acid reacts with sodium sulfide, hydrogen sulfide gas and sodium chloride are produced. How many moles of H2S will be generated by 2.56 moles of HCl?

2HCl + Na2S → H2S + 2NaCl

mol H2S = 1.28 mol

Explanation:

balanced reaction:

∴ moles HCl = 2.56 mol

⇒ moles H2S = ?

⇒ moles H2S = (2.56 mol HCl)*(mol H2S/2 moles HCl)

⇒ moles H2S = 1.28 mol

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).