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If the theoretical yield for a reaction was 156 grams and I actually made 122 grams of the product, what is my percent yield?options:
64.0%78.2%19.0%128%
Explain in terms of their structures why each of the following pairs of substances have very different chemical and physical properties (a) Silica and carbon dioxide (b) oxygen and sulfur
How many moles of NaCl2 can be formed in the reaction of 5.00 molof Ni and 10.0 mol of HCl
A tank of oxygen holds 20.0 L of oxygen (O2) at a pressure of 15.0 atm. When the gas is released, it provides 300. L of oxygen. What is the pressure of this same gas at a volume of 300. L and constant temperature
A large amount of aqueous ammonia is added to a Cd^2+ solution and the complex ion Cd(NH3)4^2+ forms. Write the equation for this reaction.
calculated on the basis of 1g mol pV = zRT so U = H- pV = H-zRT U ?=16,660-0.96/ x 8.314/ x 283/ x /1000=16,658 Is this calculation correct
A cube of metal has a mass of 0.321 kg and measures 3.05 cm on a side. Calculate the density and identify the metal.
draw the structure of a compound C5H8O that reacts with 2,4-dinitrophenylhydrazine, decolorizes bromine in dichloromethane, but does not give a positive iodoform test.
A solution is made by dissolving 3.14g of NaCl in 79.9mL of water. What is the concentration of sodium chloride in units of weight/volume percent?
Use average bond energies to estimate enthalpy changes for C(s) + CO2(g) -----> 2CO(g) i got -221 kj/mol, but it was the wrong answer though.
Under a given set of conditions, benzene C6H6 (b.p. 80°C) has a retention time of 60 seconds using a GC column. Under these same conditions, would you expect the retention time of toluene C7H8
An unknown mass of each of sand, initially at 24.0, absorbs 1970 of heat. The final temperature is 62.2 degrees C. Find the mass of sand.
need to dissolve CaCl2 in water to make a mixture that is 31.0% calcium chloride by mass. If the total mass of the mixture is 405.5 g, what masses of CaCl2 and water should be used?
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