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What letter on the diagram represents a gas?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Which of these describes the rate of this chemical reaction? h2 + cl2 → 2 hcl a. an increase in the concentration of hcl and h2 with time b. an increase in the concentration of hcl with time c. an increase in h2 and cl2 with time d. a decrease in hcl and cl2 with time

Among the elements of the main group the first ionization energy increases