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Methyl orange is an indicator that changes color over a range from pH =3.1 to pH =4.4 . What is Ka of methyl orange?
400cm3 of glycerol, C3H8O3 (density= 1.26 g cm-3) is added to a kilogram of water. What is the mole fraction of C3H8O3 in the solution?
How many grams of sodium phosphate Na3PO4(163.9 g/mol) are contained in 205. mL of a sodium phosphate solution that is 0.194 M in sodium ion Na+?
A researcher suspects that the pressure gauge on a 49.9-L gas cylinder containing nitric oxide is broken. An empty gas cylinder weighs 135 lb. The weight of the partially full cylinder is 164.2 lb.
What is the sequence of the peptide? Use the one-letter abbreviations for the amino acids, and do not use dashes.
which had been effectively diluted to a volume of 200mL? b) how many grams of Cu were in the sample? c) how many grams of Cl were in the sample? How many moles? d) What is the formula of the copper chloride compound?
Both the meta- and para- forms of phenylene diamine are used in the production of Kevlar and Nomex, respectively. Why is a corresponding material with similar properties not made from ortho-phenylene diamine, and why is the ortho-form of the diami..
Express the concentration of a 0.0460 M aqueous solution of fluoride, F-, in mass percentage and in parts per million. Assume the density of the solution is 1.00g/mL.
Calculate the PH of the cathode compartment solution if the cell emf at 298K is measured to be 0.660V when (Zn^2+)=0.22 M and(P_H2)= 0.87atm
A 2.85 g sample containing only MgO and CuO is placed in a 3.00 L container. The container is filled with CO2 to a pressure of 740 torr at 20 degrees C. After the reaction has gone to completion, the pressure inside the flask is 390 torr at 20 deg..
It should shift to the right because the removal of a component causes the equilibrium to shift to the side from which the component was removed.
Three gases (8.00 rm g of methane, CH_4, 18.0 g of ethane, C_2H_6, and an unknown amount of propane, C_3H_8) were added to the same 10.0 L container.
Determine the ΔH solution for this compound If the heat of solvation for this compound = -30.8 kJ/mol , crystal lattice energy = -62.2 kJ/mol.
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