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At what temperature is the reduction of tungsten(VI) oxide by hydrogen to give metallic tungsten and steam spontaneous? The standard heat of formation of WO3(s) is -843 kJ/mol, and its standard molar entropy is 76 J(K mol).
Which of the following reaction sequences can be used to prepare m-chloroaniline starting from benzene
copperii chloride and leadii nitrate react in aqueous solutions by double replacement. write the balanced chemical
Problem- What are the concentrations of h30 and oh- in oranges with a ph of 3.80? I got h30=10^-3.80= 1.58x10^-4
the value of delta h for the reaction h2 g plus br2 g yields 2hbr g is -72 kj. how many kj of heat are releasedwhen 1.0
determined the acid ionization constant (Ka) for the acid to be: Ka = 2.53 X 10-6. What is the weak acid and what is Kb for the conjugate base of the weak acid?
Pure 2-methylpentane is held in a closed container at 150F. Both gas and liquid are present. What is the pressure in the container
A compressed-air tank carried by scuba divers has a volume of 6.80L and a pressure of 120atm at 20 degrees celsius. What is the volume of air in the tank at 0 degrees celsius and 1.00atm pressure (STP)
what is the pH of a solution formed by combining 200.0 mL of 0.16 M HCL with 300.0 mL of 0.091 M NaOH at 25 degrees celcius
What is the molar concentration of the excess reactant once this reaction has finished? (40%)
when ammonia is burned in oxygen, free nitrogen gas and water are produced. What volume of ammonia will react completely with 25.0 L of oxygen? what volume of nitrogen gas is formed.
H2(g) + F2(g) 2HF(g) H = -542 kJ How many grams of H2(g) would have to react to produce 197 kJ of energy?
The enthalpy change for the reaction of 50.0ml of ethylene with 50.0ml of H2 at 1.5 atm pressure (problem ^H= -0.31kj. What is the value of ^E
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