Question

A Review | Const Part A The zinc within a copper-plated penny will dissolve in hydrochloric acid if the copper coating is filed down in several spots (so that the hydrochloric acid can get to the zinc). The reaction between the acid and the zinc is 2H+ (aq) + Zn(s) + H2(g) + Zn2+ (aq). When the zinc in a certain penny dissolves, the total volume of gas collected over water at 25°C was 0.949 L at a total pressure of 0.992 bar . What mass of hydrogen gas was collected? IVO ALO * 0 2 ? m = Submit Request Answer

Answer 1

Answer) Temperature (T) = 25°C = 25 + 273 = 298 K Volume CV) = 0.949L pressure (P) = 0.992 bar = 0.979 atm Gas constant CR) = 0.0821 h. atm mot kn moles Cn) = ? According to Ideal gas eq" PV = nRT n = Per n 0.979 Catów) x 0.94966) - 0.0821 (h. athu ) x 298 (4) MOIS n=0.038 mol of H₂ mass of H₂ collected = = = moles of H₂ x molas mass of H₂ 0.038 CROT X 2 (g/mor 0.076g