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a) Tartaric acid is composed of carbon, hydrogen and oxygen. A sample weighing 0.400g is subjected to combustion analysis and produced 0.469g carbon dioxide and 0.144g water. Find the empirical formula of tartaric acid.
b) The molar mass of tartaric acid is 150g/mol. Calculate its molecular formula.
For each of the following processes, decide whether it is spontaneous or non-spontaneous.
how much kaolin (in grams) should be used to prepare 2.0g of a 1:30 dilution of hyoscine in kaolin? Both substances are solids.
Assume that the kinetic energy of a 1250 kg car moving at 115 km/h could be converted entirely into heat. What amount of water could be heated from 19 C to 48 C by the car's energy.
How much of a 12.0 M HNO3 solution should you use to make 850.0 ml of a 0.250M HNO3 soution? C) How much of a 5.0 M sucrose solution should you use to make 85.0 ml of a 0.040 M solution?
Construct a reaction table for the process, and use it to calculate Kc at this temperature.
The difference in aqueous nucleophilicity between Cl- and Br- is observed in the product distribution for the Sn2 reaction of 1-butanol (n-butyl alcohol) but not for the Sn1 reaction of 2-methyl-2-propanol
If 26.23mL of potassium permanganate solution is required to titrate 1.041g of ferrous ammonium sulfate hexahydrate, FeSO4(NH4)SO46H2O.
For the competitive reaction between an equimolar propanal/acetone mixture and cyanide, show that PA/PK = kA/kk
A carboxylic acid favours the ion form (R-COO-) and its pH is higher than its pKa. In most membranes, the polar heads of the phospholipids align towards the middle of the membrane.
Nitrosyl chloride (NOCl) decomposes at elevated temperatures according to the equation 2NOCl(g) ->2NO(g) + Cl2(g). Calculate Kp for this reaction at 680°C. (For this reaction ΔH° = 81.2 kJ/mol, ΔS° = 128 J/K·mol)
what is the density of a block of marble that occupies 285 centimeters cubed and has a mass of 636 grams? answer in units of g/centimeters cubed.
Butane lighters work very poorly outdoors in the cold weather. If 12.7 mL of butane gas is released from a lighter at 22 degrees celcius, what volume would the same amount of butane occupy at 11 degrees celcius?
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