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A simple method for the laboratory preparation of hydrogen involves reaction of zinc with hydrochloric acidZn(s) + 2 HCl(aq) ® ZnCl2(aq) + H2(g) DH = -152.5 kJ
Explain how much heat in kilojoules are evolved if a total of 968.4mL of H2 was collected over water at 14.00°C as well as an atmospheric pressure of 557.04 mm Hg. The partial pressure of water at this temperature is11.99 mm Hg? Presume heat evolved is directly proportional to the moles produced.
calculate the volume, in liters, of each of the following solutions that provides the given amount of solute: a)5.00 mol of NaOH from a 12.0 M solution. b)15.0 g of Na2SO4 from a 4.00 M solution. c)28.0 g of NaHCO3 from a 1.50 M solution.
Starch and cellulose are both made of chains of glucose units. The human body can digest starch but why can it not digest cellulose
In an Fe and Cr voltaic cell where the Fe is in Fe(NO3)2 and the Cr is in Cr(NO3)3; calculate the cell potential at 25 C if the initial concentration in the half cells are as follows [Cr 3+] = 2.45M and [Fe 2+] = .75 M
Rxn of triphenylphosphine with benzyl bromide produces the corresponding phosphonium salt. Suggest a suitable mechanism for this rxn
0.2 M HCl is used to neutralize 20 mL of 0.35 M NaOH. a. How many moles of OH- are present?
if 2.15 g of an unknown solid nonelectrplyte is dissolved in18.1 g of naphthalene the resulting solution is
if the height of the mercury column in the leveling bulb is 20 mm greater than that in the gas buret and the atmospheric pressure is 650 mm, what is the pressure of the gas trapped in the buret?
Which options apply to Purines and Pyrimidines Purines: 1) contain one heterocyclic ring 2) contain two heterocylic rings 3) contain only two ring nitrogens 4) contain only three ring nitrogens
question a 1.71 mol sample of ar gas is confined in a 41.9 liter container at 25.7 c. if the volume of the gas sample
a 100-w lightbulb is placed in a cylinder equipped with a moveable piston. the lightbulb is turned on for 2.0times10-2
what is the valence molecular orbital configuration (according to MO theory) of homonucleic diatomic species where the atoms have an atomic number greater than seven?
an isolated quantity of an ideal gas at 294.2 k has a volume of 20.46 l at a pressure of 1.18 atm. what is the pressure
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