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Galena (an ore) is partially oxidized by...

Galena (an ore) is partially oxidized by passing air through it at high temperature. After some time, the passage of air is stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of `O_(2)` consumed is ____. (Atomic weights in g `mol^(1)`: O = 16, S = 32, Pb = 207)

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6.47
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Galena (an ore) is partially oxidised by passing air through it at high temperature. After some time the passage of air stopped, but the heating is continued in a closed furnace such that the contents undergo self-reduction. The weight (in kg) of Pb produced per kg of O_(2) consumed is_ , "Atomic weights in g mol"^(-1): O =16,S=32,Pb=207

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by "NiCl"_(2).6H_(2)O to form a stable coordination compound. Assume that both the reactions are 100% complete. If 1584 g of ammonium sulphate and 952 g of "NiCl"_(2).6H_(2)O are used in the preparation, the combined weight (in grams) of gypsum and the nickel- ammonia coordination compound thus produced is ____. (Atomic weights in g "mol"^(-1) : H = 1, N = 14, O = 16, S = 32, Cl = 35.5, Ca = 40, Ni = 59)

The ammonia prepared by treating ammonium sulphate with calcium hydroxide is completely used by NiCl_(2), 6H_(2)O to form a stable coodinate compound. Assume that both the reaction are 100% complete. If 1584g of ammonium sulphate and 952g of NiCl_(2). 6H_(2)O are used in the preaparation the combined weight (in grams) of gypsum and the nickel-ammonia coordination compound thus produced is Atomic weight is g mol^(-1): H-1, N=14, O=16, S=32, Cl=35.5, Ca=40, Ni=59)

Lowering in vapour pressure is determined by Ostwald and Walker dynamic methed. It is based on the prinicipal , that when air is allowed to pass through a solvent or solution, it takes up solventvapour with it to get itself saturated at that temperature I and II are weighted separately before and after passing dry air. Loss in mass of each set, gives the lowing of vapour pressure. The temperature of air, the solution and the solvent is kept constant. Dry air was passed thorough 9.24 g of solute in 108 g of water and then through pure water. The loss in mass of solution was 3.2 g and that of pure water 0.08 g . The molecular mass (g/mol) of solute is nearly :