Question

Commercial drain cleaners s e s contain a mixture of suminum powder and NaOH. When the mixis poured down a clogged drain, the following us 2 NaOH(aq) + 2Al(s) HOM2NAOH(aq) + Hg) + Haut Heat melts grease and a breaks up the clogs What volume of hydrogen is formed at 1.00 atm and 21.0°C when 5.00 g of Al are treated with exc NaOH? 7. The mass percent of HCOs in a certain 3 20 9 Alka Seltzer tablet is 32.5% How many mL of carbon dioxide will be generated when the Alka Seltzer reacts with the HCI in a person's stomach at a pressure 780 torr and a temperature 37 0°C? HCO3 + HCl(aq) Cl(aq) + H2O) CÔag) 8. What mass of NaNs is needed to inflate an 18.0 L air bag in an automobile at 25.0°C and 1.00 atm according to the following reaction? 6NaNo(s) + Fe2O3(s) → Na2O(s) + 2Fe(s) + 9Na(g)

Answer 1

Given Reaction 4 + 2Al(s) + 6H0(l) - 2 NaAlC0H), laq) + 3 H218) NaOH is present in excess We have 5.oog 'All Molar mass of 'Al' = 26.989/ mole No of moles of Al = 5.00g = 0.1853 mole 26.98glnde - 2 mole 3 mole of 'All reacts with Naohl exceses to give of Haig according to balanced reaction. & No of moles of High Produced by 0.1853 x 0. 1853) mole H = 0.278 mole Given poressure = P = l-coaton T = Temperature = 21°c (214 273) K = 294k PV = nRT [oo Ideal Gas equation / R = Universal Gas Constant = 0.00821 L-atm.motok 1- oatm x V = 0_272 mde X0-00821L-uton moi'k 'X299 k V = 0.671L / Answer V = volume of hig) formed