When 3.0 mol al react with 7.0 mol hcl, what is the limiting reactant and how many moles of h2 can be formed? 2al + 6hcl yields 2alcl3 + 3h2 (2 points) al is the limiting reactant, and 3.0 mol h2 can be formed hcl is the limiting reactant, and 2.3 mol h2 can be formed al is the limiting reactant, and 4.0 mol h2 can be formed hcl is the limiting reactant, and 3.5 mol h2 can be forme

Can someone me with 1 to 4 plz. fast

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.