Hydrochloric acid can dissolve solid iron according to the following reaction. Fe(s)+2HCl(aq)→FeCl2(aq)+H2(g) a) What minimum mass of HClHCl in grams would you need to dissolve a 2.4 gg iron bar on a padlock? Express your answer using two significant figures.   B) How much H2H2 would be produced by the complete reaction of the iron bar? Express your answer using two significant figures.

According to the following reaction, how many grams of iron(II) oxide will be formed upon the complete reaction of 21.0 grams of oxygen gas with excess iron? iron (s) + oxygen (g) →→→iron(II) oxide (s) grams iron(II) oxide

One way the U.S. Environmental Protection Agency (EPA) tests for chloride contaminants in water is by titrating a sample of silver nitrate solution. Any chloride anions in solution will combine with the silver cations to produce bright white silver chloride precipitate. Suppose an EPA chemist tests a 200. mL sample of groundwater known to be contaminated with cadmium chloride, which would react with silver nitrate solution like this: CdCl₂(aq) + 2 AgNO3(aq) → 2 AgCl(s) + Cd(NO3)₂(aq) The chemist adds 75.0 mM silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected 7.0 mg of silver chloride. Calculate the concentration of cadmium chloride contaminant in the original groundwater sample. Be sure your answer has the correct number of significant digits. mg L

Thermite is a metal powder mixture used frequently in pyrotechnics and metal construction work. It is composed of highly powderized aluminum and iron(III) oxide and when ignited by a high temperature source (such as burning magnesium ribbon), it reacts according to the following equation. Fe2O3(s) + 2 Al(s) → 2 Fe(l) + Al2O3(s) What mass of powderized Al is required to completely react with 35.3 g Fe2O3?