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How many grams of ethyl alcohol, C2H5OH, must be added to 1.000 kg of water so that the solution will not freeze until -20 degrees Celsius? For water, Kf=1.86 degrees Celsius/m
On the assumption that the debye-Huckel limiting law applies, what is the value of the solubility product equilibrium constant Ksp for AgCl in such conditions?
A sample of 5.20ml of diethylether (C2H5OC2H5; density=0.7134g/ml) is introduces into a 6.40L vessel that already contains a mixture of N2 and O2 whose partial pressures are PN2=0.751atm and PO2=0.209atm
Calculate the reaction quotient Qc and find out at which temperature and
What mass of P4 is produced when 41.5 g of Ca3(PO4)2, 26.5 g of SiO2 and 7.80 g of C are reacted according to the equation: 2Ca3(PO4)2 + 6SiO2 + 10C ¼ P4 + 6CaSiO3 + 10C
A rectangular block has dimensions 2.9 cm 4.0 cm 10.0 cm. The mass of the block is 625.0 g. What is the volume of the block?
How many grams of water can be cooled from 37 C to 20 C by the evaporation of 45 gm of water?
Determine the molality and molarity of a solution made by dissolving 445 g of NaBr in 2600 ml of water ?
While preparing oxalate buffer technician by mistake added 0.1 M of CaC2O4. (pKsp = 7.9) to 0.2 M solution of oxalic acid
Will the yeast cells or the corn seedling have a higher metabolic rate when compared on a mass specific basis (in moles ATP/gram organism x hr)?
Consider the following equilibria for phosphoric acid. H3PO4 ? H+ + H2PO4- K1 = 7.11 x 10-3 H2PO4- ? H+ + HPO42- K2 = 6.34 x 10-8 HPO42- ? H+ + PO43- K3 = 4.22 x 10-13
25 g of a certain metal is heated in boiling water and then poured into 90 mL of water initially at 22.0oC. After the water has resumed a constant temperature.
the compound freon-12 (CCl2F2) is used as a coolant in refrigerators and air conditioners. It is produced through the following reaction: CCl4+SbF3-> CCl2F2+SbCl3. If 15.0 mole of freon-12 are to be produced, what mass of the carbon tetrachloride ..
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