141.If the solubility product of CuS is 6 x 10–16, calculate the maximum molarity of CuS in aqueous solution.
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142.Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 of C9H8O4 is dissolved in 400 g of CH3CN.
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Long Answer Type
143.Calculate the molarity of 1 litre solution of 93% H2SO4 (weight/volume). The density of solution is 1.84 gm L–1.
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Short Answer Type
144.Calculate the amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 M solution in methanol.
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145.Calculate the depression in the freezing of water when 10 g of CH3CH2CHCICOOH is added to 250 g of water. Ka = 1.4 x 10–3, Kf = 1.86 K kg moL–1.
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146.Nalorphene (C19 H21 NO3) similar to morphine, is used to combat withdrawl symptoms in narcotic users. Dose of nalophene generally given is 1.5 mg. Calculate the mass of 1.5 x10–3 m aqueous solution required for the above dose.
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147.Vapour pressure of water at 293 K is 17.535 mm Hg. Calculate the vapour pressure of water at 293 K when 25 g of glucose is dissolved in 450 g of water.
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148.Henry's law constant for the molality of methane in benzene at 298 K is 4.27 x 105mm Hg. Calculate the solubility of methane in benzene at 298 K under 760 mm Hg.
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149.Determine the amount of CaCl2 (i = 2.47) dissolved in 2.5 litre of water such that its osmotic pressure is 0.75 atm at 270C.
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150.Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K2SO4 in 2 litre of water at 250 C, assuming that it is completely dissociated.
Short Answer Type
Long Answer Type
