Question

read through the question below and determine the known substance and the unknown substance. calculate the mass in grams of hydrogen chloride produced when 5.6 l of molecular hydrogen measured at stp react with an excess of molecular chlorine gas. known is the molecular hydrogen. unknown is the hydrogen chloride. known is the molecular chlorine. unknown is the molecular hydrogen known is the molecular chlorine. unknown is the hydrogen chloride known is the molecular hydrogen, unknown is the molecular chlorine.

Explanation:

The problem is about calculating the mass of hydrogen chloride produced from the reaction of molecular hydrogen (with a given volume at STP) and excess molecular chlorine. The known substance is the one with given information (molecular hydrogen), and the unknown is what we need to find (hydrogen chloride). The first option correctly identifies this.

Answer:

A. Known is the molecular hydrogen. Unknown is the hydrogen chloride.