What volume of H2S (L) is produced at STP when 39.0 grams of Na2S react with an excess of HC1 as shown in the equation: Na2S + 2 HC1 → H2S + 2 NaCl?

The excretory system,need answers for all: )

When the mercury level in a barometer decreases that atmospheric pressure has

Iron (fe) reacts with copper sulfate (cuso4) to form iron (ii) sulfate. in this reaction, cu2+ gains electrons to form cu. which statement is true about this reaction? fe(s) + cuso4(aq) → feso4(aq) + cu(s)