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To obtain a 18.0% (w/v) solution of copper sulfate (CuSO4), M.W = 160) when only the crystalline salt is available (CuSO4 x 5H2O, M.W. = 250) what should the crystalline salt be weight to prepare 450.0 mL of solution?
When heated together, lead (II) sulphide, PbS, and lead (II) oxide, PbO, produce elemental lead and sulphur dioxide, SO2. Write a balanced equation for this reaction.
Calculate(a) the molar concentration of the ammonia and (b) the mass/mass % concentration of ammonia (17.04g/mol). given a solution density of 0.990 g/mL, HCI (aq) + NH3(aq) -right arrow NH4Cl(aq)
to determine the molecular formula of a compound.a compound of p and f was analyzed as follows heating 0.2324 g of the
Calculate the change in internal energy, (Delta E) for the reaction. What is the enthalpy of formation per mole of product for the reaction
What volume of a stock 0.0242 M of KOH solution is required to titrate 0.147 g of oxalic acid dehydrate, H2C2H4 . 2H2O to a phenolphthalein endpoint?
Suppose you are given 150 mg of an unknown mixture that contains three compounds, and you are told to separate the compounds using column chromatography
C2H5OH (l) + 3O2(g) ---------> 2CO2(g) + 3H2O(l) ?H = - 1.37 x 103 kJ When a 24.8-g sample of ethyl alcohol (molar mass = 46.07 g/mol) is burned, how much energy is released as heat?
Calculate the mass of nitrogen dissolved at room temperature in an 84.0 home aquarium. Assume a total pressure of 1.0 and a mole fraction for nitrogen of 0.78.
Esters can be hydrolyzed when heated with water and strong acids or bases- the reverse of Fischer esterification. However, whereas Fischer esterification is reversible, ester hydrolysis when carried out in aqueous base is not. This is because
How many electrons could occupy a subshell with the following quantum numbers? A) n=5, l=4, B) n=2, l=0, ml=0
40.0 ml of an acetic acid of unknown concentration is titrated with 0.100 M NaOH. After 20.0 mL of the base solution has been added, the pH in the titration flask is 5.10. What was the concentration of the original acetic acid solution. (Ka(CH3COO..
Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO3 and 295 mL of water. Density of water is 0.997 g/mL.
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