Assume that all the acid reacts with, and thus dissolves through, the foilWhat will be the surface area in cm2 of the cylindrical hole produced? (Density of Al 2.70g/cm^3; foil thickness 0.10mm) 2Al (s) + 6HCl (aq) -gt; 2AlCl3 (aq) + 3H2 (g)
A light-weight polyester will probably not keep you very warmThe fabric looks good for the first year and as it wears, starts to pill (form little balls on the surface)Further, it melts easilyDon't spill any nail polish on it.
Molar mass of HCl (1+35.5) g mol^-1 36.5 g mol^-1 Now, 1000 ml of HCl 1236.5 g 0.05 ml 0.0219 g Therefore 0.0219 g of HCl reacts completely with the aluminium foilBy stoichiometry, 6 moles of HCl needs 2 moles of Al or, 3 moles of HCl needs 1 moles of Al or, 336.5 g of HCl needs 27 g of Al or, 0.0219 g of HCl needs 0.0054 g of Al Volume of aluminium foil that reacted 0.0054/2.70 cm^3 0.002 cm^3 Height of the foil 0.10mm 0.010 cm Now, Voume areaheight area Volume/height 0.002/0.010 cm^2 0.2 cm^3 Therefore the surface area of the hole is 0.2 cm^2 Follow up Hello gerbardaysee Can you please tell me that from where or from which book did you get this question? I am Raunak from IndiaI just want to know that of which standard is the question, because I liked thatI would be grateful if you provide the name and the author of the book along with the age group to which it falls.
no, polyester isnt necessarily a bad fabricand it might keep you warm, who knows? probably
