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1. A sample of sodium carbonate (Na2CO3), which is a base (assume the titration endpoint is reached when one proton has been transfered, producing NaHCO3), with a mass of 0.2892 g is dissolved in water and used to standardize a solution of perchloric acid. An endpoint is reached when 32.03 mL of perchloric acid has been added. Determine the molarity (in mol/L) of the perchloric acid solution. Report your answer to four significant figures.
2. The standardized perchloric acid solution is then used to titrate 41.10 mL of a solution of sodium lactate (NaC2H5OCOO). An endpoint is reached when 18.22 mL of perchloric acid has been added. Determine the molarity (in mol/L) of the sodium lactate solution. Report your answer to four significant figures.
At a certain temperature the vapor pressure of pure benzene and pure toluene are 380 torr and 130 torr, respectively.
when aluminum is heated in oxygen, aluminum oxide is formed. What weight of the oxide can be obtained from 25.0 g of the metal.
A solution of ammonia and water contains 2.10×1025 water molecules and 5.30×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
Sodium saccharin, is a nucleophile, but DMF is not. Explain why
The gas is collected over water . If 156 mL of gas is collected at 19oC and 769 mmHg total pressure, what is the mass of hydrogen collected?
Equal quantities of 0.010M solutions of an acid HA and a base B are mixed. The pH of the resulting solution is 9.4. A) If Ka for HA is 9.0×10?5, what is the value of the equilibrium constant for the reaction between HA and B
The enthalpy of fusion of methanol is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol
Compute the molecular formula of CH 3 COOH the percent composition of acetic acid is 39.99% C and 6.73% H. The remainder of the compound is oxygen.(The molar mass of acetic acid is 60.06 g/mol.)
two excited triplet states are found 13814 and 15891 cm^-1 above the ground state. calculate the Helmholtz energy for this molecule at room tempreature and 1 atm.
A 1.40 mL sample containing chromium-51 as a tracer was injected into a patient. Z After several hours a 5.50 mL of blood was drawn and its ctivity compared to the injected tracer sample.
At 50 degree's Celsius the vapor pressure for methanol and ethanol are 406 and 222 torr, respectively. Given a mixture at 50 degree's Celsius that contains 0.2 mol of methanol and 0.1 mol of ethanol, compute the partial pressures of each liquid an..
Identify the incorrect names or formulas.
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