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The standard recipe used in an exercise uses 3.0 mL of 0.25% phenanthroline solution in 100 mL of final solution to generate the red iron-phenanthroline complex which is determined colorimetrically. What is the initial molarity of phenanthroline in the diluted solution? (0.25% means 2.50 g of phenanthroline (molar mass 180) per liter of solution).
Calculate the formula weight of CuSO4 . Use the following atomic weights: Cu is 63.5463 g/mol, S is 32.0666 g/mol, and O is 15.99943 g/mol. Your reported answer should have the correct number of significant figures and units.
A system obtains the amount of heat equal to q > 0 from the surroundings at constant volume. Will the internal energy of the system increase, decrease, or remain constant? Will the temperature of the system increase or decrease
zinc metal is amphoteric and will react similarity to aluminum metal dissolving in aqueous strong base. write a
This strontium isotope is radioactive, with a half-life of 28.1 yr. Calculate how long it will take for 0.890 g of the isotope to be reduced to 0.250 g by decay.
What is the ratio of C-14 in a wooden object made in 100 BC to the one made of the same kind of wood in 700 BC? Half life of carbon-14 is 5730 years.
What does the kinetic molecular theory of gases state about the average kinetic energy of the gas particles
Health Canada recommends a an upper level intake of Na to be 2300 mg. How many ounces (oz) of the meat must be ingested for a person to meet this level?
What volume of H2 gas (in L ), measured at 742 mmHg and 84C, is required to synthesize 25.8g of CH3OH ?
Under what conditions will the endothermic reaction, 2 Na2O(s) 4 Na(s) + O2(g), be spontaneous?
List the procedures to prepare 100.00 ml of a 0.1M NaOH solution from a 10% NaOH solution. (MW of NaOH=40.00, d of solution= 1.0 g/ml)
You are in a labratory and need to make 90 mL of a solution that is 2 micrograms Eb per 0.1 mL safflower oil. outline the steps and calculations.
hydrogen gas is produced when zinc reacts with sulfuric acidnbsp if 162 of wet is collected over water at 24 and a
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