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A 250.0 -mL buffer solution initially contains 2.5X10^-2 M of HCHO2 and 2.5X10^-2 M of NaCHO2. What mass of the correct reagent should you add?
Elliptical holes estimate the angle of entry : Cos A bullet hole in a wall at a crime scene is elliptically shaped. The loner dimension is 20 mm and the shorter dimension is 14 mm. What is the angle of entry?
a reaction known to release heat of four kilo joules takes place in a calorimeter containing two litres of solution and
write seperate oxidation and reduction half reactions3 no3- aq 8al s 5 oh- aq 18 h2ol ---gt 3 nh3 g 8 aloh4-
What is the molecular weight of a volatile liquid, if .50 g of the liquid fills a 100 mL flask as a gas at 25 degrees C and 1.0 atm pressure
Calculate the theoretical titration curve for the titration of 50.00 mL of 0.1000 M Na2CO3 with a 0.2000 M solution of HCl. Propose the indicators.
As a technician in a large pharmaceutical research firm, you need to produce 400 mL of 1.00 M potassium phosphate buffer solution of pH = 7.29. The pKa of H_2PO_4^- is 7.21.
gaseous carbon dioxide and liquid water react in the presence of chlorophyll to produce aqueous glucose (c6h12o6 ) and oxygen gas.
The solution to Equilibrium constant, A certain gas mixture held at 395C has the following initial partial pressures: P(Cl2) = 351.4 torr; P(CO) = 342.0 torr and P(COCl2) = 0.
A 2.20 g sample of a large boimolecule was dissolved in 13.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule.
Explain how to prepare 0.250 L of a 0.500 M CuSO4 solution. 1. Measure out 0.500 moles of CuSO4 solid 2. Measure out 20.0 g of CuSO4 solid 3. Measure out 0.500 moles of CuSO4 solid and add water until a volume of 1.0 L is reached 4
the cup is a volume widely used by cooks in the u.s. one cup is equivalent to 237 cm3. if 1 cup of olive oil has mass
Calculate the molecular rms speeds of He atoms at 10, 100, 1000 K in units of meters per second and miles per hour.
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