Ammonia reacts with hydrogen chloride in the gas phase to produce the ionic compound ammonium chloride via the reaction NH3(g) + HCl(g) ➔ NH4Cl(s). What is the percent yield of ammonium chloride if 0.81 g of NH4Cl is formed when 0.75 g of NH3 is reacted with 0.62 g HCl?

10. according to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

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.)

Will mark brainliest how many electrons can be held in the energy level n = 4?