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A chromium-containing compound has the formula Fe(x)Cr(y)O4 and is 28.59% oxygen by mass. Find x and y.
At 2000°C the equilibrium constant for the reaction is Kc = 2.4 103. 2 NO(g) N2(g) + O2(g) If the initial concentration of NO is 0.100 M, what are the equilibrium concentrations of NO, N2, and O
At 7645 oC, Keq = 1.12 for the reaction: 1/2 N2(g) + 1/2 O2(g) ? NO2(g) (a) What is the value of Keq for the reaction NO2(g) ? 1/2 N2(g) + 1/2 O2(g)? Keq = . (b) What is the value of Keq for the rea
The following equilibrium is established: 1 H2O(g) + 1 CH4(g) ? 1 CO(g) + 3 H2(g) At equilibrium 0.03264 mol of CH4 is found in the reaction mixture. (a) Calculate the equilibrium partial pressures
At 1478 oC the equilibrium constant for the reaction: 2 IBr(g) ? I2(g) + Br2(g) is KP = 0.899. If the initial pressure of IBr is 0.00169 atm, what are the equilibrium partial pressures of IBr, I2, a
Draw the molecular orbitals for the following molecules CH20. Label the hybridization of all non-hydrogen atoms
The specific heat of an unknown metal is found to be 0.233 J/K g. The Law of Dulong and Petit predicts a molar heat capacity of 26 J/K mol. Use this law to estimate the molar mass of the metal.
What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 19.0 L of water to produce an antifreeze solution with a freezing point of -34.0°C
Draw the molecular orbitals for the following molecules. Label the hybridization of all non-hydrogen atoms BF3, CH20, O3
A piece of silver metal weighing 194.3 g is placed in a graduated cylinder containing 242.0 mL of water. The volume of water is displaced and now reads 260.5 mL. Calculate the density of sliver in g
Use an orbital diagram to draw the molecular orbital for H2+. Do you predict this molecule will be stable? Explain your logic.
The combustion of 58.0 g of butane (C4H10) produces 158g of CO2. What is the percent yield of the reaction
A mole of sodium hydroxide has a mass of 40 g. In order to prepare a .1M solution, how many grams of sodium hydroxide must be added to 500 mL of water
How much water would you add to 50.0mL of 0.400M NaOH if you wanted the final concentration to be 0.200M ?
Methanol (CH3OH) can be manufactured by the reaction of gaseous carbon monoxide and hydrogen. Suppose 68.5 kg of gaseous carbon monoxide is reacted with 8.60 kg of gaseous hydrogen. If 37.5 kg of me
When 1 mol of HF is added to 1kg of water, the freezing point decreases by 1.9 C, but when 1 mol of HBr is added, the freezing point decreases by 3.7 C. Which is more highly separated into ions, HF
How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range
How many grams of solute are needed to prepare the following solutions? 1. 135.0mL of 22 % (w/v) glucose (C6H12O6) 2. 60mL of 4.6 % (w/v) (KCl)
Which of the following pairs would NOT interact to produce an attractive/favorable weak interaction within a proteins 3D structure at physiologic pH.
Automobile antifreeze is made by mixing equal volumes of ethylene glycol (d=1.114 g/mL, MW= 62.07 g/mol) and water (d=1.00 g/L, MW= 18.02 g/mol). Assume that the volume are additivr, calculate conce
What volume of a 0.500 M hydrochloric acid solution is needed to neutralize each of the following, respectively: a) 10.00 mL 0.300 M sodium hydroxide ; b) 10.00 mL 0.200 M barium hydroxide
If the recorded value of the unknown sample in her lab report was 22.5 g, what was the actual value of the sample
If Dan is working in the lab and measures the mass of an iron rod to be 1.25 g and the accepted value from the instructor was given as 1.30 g, what was dan's percent error
How many grams of solute are needed to prepare the following solutions? 1. 135.0mL of 22% (w/v) glucose (C6H12O6) 2. 60mL of 4.6% (w/v) (KCl)