If 72.0 grams of aluminum are reacted with 252 grams of hydrochloric acid, what is the mass of the excess reactant leftover after the reaction has reached completion? 2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g)

a - 9.84 g
b - 55.3g
c - 72.4g
d - 180g

Who is better, messi or cristiano, i need this for a chemistry class. asap

When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? c7h16o(g) + o2(g) → co2(g) + h2o(g) -1 -5 -8 -16 -21

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate