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Compound A is reacted by CrO3 in H2SO4 to give compound B. Compound B gives a molecular ion peak of 134 on low resolution mass spec as well as has a DU=5. Explain what is the molecular formula?
A miniature volanco can be made in the laboratory with ammonium dichromate. When ignited, it decomposes in a fiery display. (NH4)2Cr2O7(s) ? N2(g) + 4 H2O(g) + Cr2O3(s) If 0.95 g of ammonium dichromate
if copper has a photoelectric threshold wavelength of 279 nm calculate the velocity ms of the electron emitted when
Hydrchloric acid is usually purchased in a concentrated form that is 37.0% HCL by mass and has a density of 1.20g/ml. How much concentrated solution would you take to prepare 2.85L of 0.410M HCl by mixing with water
which of the following is not consistent with the role water plays in dissociating ionic compounds?a. when an ionic
Vitamin C (L-ascorbic acid; MW = 176.0 g/mol) is a weak acid (pKa = 4.863). Suppose a 500.0 mg tablet is dissolved in water and titrated with 0.100 M NaOH. How many mL of NaOH are required to reach the equivalence point?
With the pure solvent in the light path, the meter reading is 78; with a 0.1 M solution of a solute in the same solvent, the meter reading is 55. The light path is 0.5 cm. Calculate the absorbance, the transmittance, and the molar absorption coeff..
A compound of carbon, hydrogen, and oxygen contains 54.5% carbon and 9.10% hydrogen. what is its empirical formula
Calculate the number of moles of KOH in 9.10mL of a 0.140M KOH solution? What is the pOH of the solution at 25 C
What is the molecular formula of a compound of empirical formula CH that diffuses 1.24 times slowly than krypton at the same temperature and pressure?
the standard recipe used in an exercise uses 3.0 ml of 0.25 phenanthroline solution in 100 ml of final solution to
the temperature of a gas in a sealed, rigid, insulated container, what happens to the density of the gas?
A dancehall contains 173 men and 238 women. A certain "promenade" calls for the formation of groups, with each group consisting of one man with two women. a)How many groups could be formed? b) which sex is in excess? By how much? (show calculation..
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