11. If the reaction produces 400.0 mL of 1.5 M MgCl2, how many moles of HCl reacted? (A) 0.30 moles (B) 0.60 moles (C) 1.20 moles (D) 2.40 moles

What type (redox, acid-base, precipitation) are the reactions below? For the redox reactions, identify the element that is oxidized and reduced, as well as the oxidizing and reducing agent. For the elements that are oxidized or reduced indicate the oxidation number before and after the reaction occurs. (a)     FeCl3       +          Cu      ⟶        FeCl2       +          CuCl (b)     CuSO4       +          Pb(NO3)2         ⟶       Cu(NO3)2         +          PbSO4 (c)     NH4NO3   ⟶      N2O     +          2 H2O

Various nitrogen oxides, as well as sulfur oxides, con-tribute to acidic rainfall through complex reaction sequences.Nitrogen and oxygen combine during high-temperature combus-tion of fuels in air to form nitrogen monoxide gas, which reactswith more oxygen to form nitrogen dioxide gas. In contact withwater vapor, nitrogen dioxide forms aqueous nitric acid andmore nitrogen monoxide. (a) Write balanced equations for thesereactions. (b) Use the equations to write one overall balancedequation that does notinclude nitrogen monoxide and nitrogendioxide. (c) How many metric tons (t) of nitric acid form when1350 t of atmospheric nitrogen is consumed (1 t =1000 kg)?

A solution of Mg(NO3)2 is prepared in 425 mL of water by adding 32.0 g Mg(NO3)2. What us the concentration of nitrate ion (NO3-) in this solution? (a) 0.216 M (b) 0.432 M (c) 0.508 M (d) 1.02 M