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You measure 2.34 grams of potassium dichromate K2Cr2O7 into a volumetric flask. You dilute the potassium dichromate K2Cr2O7 with H2O to a volume of 250 mili litres. It takes 35.7 mL of this solution to titrate 17.8 mL of a solution of Sodium oxalate, or disodium oxalate in the presence of excess acid. Determine the concentration of the original Na2C2O4 solution?
Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide: 4HCL(aq) + MnO2(s) ----> MnCl2(aq) + 2H2O(l) + Cl2(g)
what effect could having too much compound in the capillary tube have on the observed melting point? a) the observed melting point would not change
how far away from equilibrium is the concentration of ADP and ATP in the cell? Answer A. equal B. slightly different C. greater than two orders of magnitude different D. greater than 6 orders of magnitude different E. greater than 12 orders of mag..
Determine both delta G and K when X represents CL2 and I2. Which reaction(s) is/are spontaneous. Which reaction happens to the greatest extent?
You are given an unknown, colorless, solution that may contain only one salt from the following set: NaA, NaB, NaC. In solution each salt dissociates completely into the Na+ ion and the anion A-, B-, or C-. The Na+ ion is a spectator ion. Given th..
Is the melting of wax a physical or chemical change? from the mass measurement only,( the mass of the candle at 0 minute is 10.1g, after 30 minutes is 7.4g) how could a chemical also be proved to have occured in the burning of candle.
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
According to the following reaction, how many grams of sulfurous acid (H2SO3) will be formed upon the complete reaction of 21.5 grams of water with excess sulfur dioxide? sulfur dioxide (g) + water (l) sulfurous acid (H2SO3) (g)
Determine the sign of ΔS sys and ΔS surr for each chemical reaction.2CO(g)+O 2 (g)?2CO 2 (g)ΔH ° rxn = -566.0 kJ. Choose from:
How much heat is required to melt 15 grams of ice at 0C? How much heat is released when 100 grams of steam condenses at 100C? If a system of ice and water has a mass of 12 grams
What is the molarity of a solution that contains 343.0 grams of phosphoric acid, H3PO4, in 2.0 L of solution
The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min. Determine the rate constant for this reaction at 760 K
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