Hydrobromic acid dissolves solid iron according to the following reaction:
Fe(s) + 2HBr(aq) → FeBr2(aq) + H2(g)

What mass of H2 would be produced by the complete reaction of the iron bar?

Express your answer using two significant figures.

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.