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What is the pH at the equivalence point in the titration of a 19.2 mL sample of a 0.388 M aqueous nitrous acid solution with a 0.490 M aqueous sodium hydroxide solution?
pH =
Calculate the heat evolved in kilojoules by the formation of the solution. Calculate the heat evoled per mole of sulfuric acid. Use n(changeH) = -(mCchangeT)
A.The molar heat capacity of silver is 25.35j/molc . How much energy would it take to raise the temperature of 11.4g of silver by 16.6c? B. what is the specific heat of silver
Draw diagrams to show the various orientations in which a p orbital and a d orbital on adjacent atoms may form bonding and antibonding molecular orbitals.
Calculate the energy of an ultraviolet photon of wavelength 106nm and that of an infrared photon with a wavelength
Below is a list of chemicals with their oral LD50 in mg/kg (rats). Select the substance that is MOST toxic to rats. DDT, 87 mg/kg malathion, 885 mg/kg carbaryl (sevin), 307 mg/kg parathion, 3 mg/kg
It's proton NMR spectrum displays 4 signals as follows: 1.0 ppm(triplet, 3H); 2.4 ppm (quartet, 2H); 3.7 ppm(singlet, 2H); 7.2 ppm (multiplet, 5H). Identify the structure of this compound.
Hydroxylamine, HONH2, readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps. Hydroxylamine has Kb of 9.1 x 10^-9. What is the pH of a 0.025M HONH2 solution
limestone is decomposed by heating to quicklime and carbon dioxide. Calculate how many grams of quicklime can be produced from 1.0 kg o limestone.
As the electron in a hydrogen atom jumps from the = 3 orbit to the = 7 orbit, does it absorb energy or emit energy?
The concentrationof the alkane C20H42 (FM= 282.55) in a particular sample in rain water is 0.2ppb. assume that the density of the rain water is close to 1.00 g/ml and find the molar concentration of C20H42.
Calculate the change of entropy for the water, ΔSwater , and for the surroundings, ΔSsur , when 1.00 mole of water freezes at 0°C and the surroundings are at (a) 0°C, (b) -2°C. Explain the physical origin of the difference.
How many liters of O2 are needed to react completely with 45.0L of H2S at STP? 2H2S(g) + 3O2(g) -> 2SO2(g) +2H20(g)
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