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What are the oxidation number of the central atom of the following species? Please explain how to do this.
HCHO
CaH2
HNO3
P4
A 10.00mL aliquot of a weak base is titrated with HCL. The equivalence point is reached after 17.21mL of 0.4332 mol/L HCL has been added. The pH is equal to 10.03 after 5.00mL of HCL was added. Determine
How many magnesiun atoms are in 3 moles of Mg3(PO4)2? 2) A substance, NxOy has the composition by mass 69.57% O. Calculate the molecular formula of this substance if its molecular mass is 92 grams.
What is the initial concentration (in M) when 17.6 mL of a sodium chloride solution was diluted with 19.4 mL of solvent to a final concentration of 0.708 M? Assume the volumes are additive.
A hypothetical element consists of two isotopes of masses 86.95 amu and 88.95 amu with abundances of 35.5% and 64.5%, respectively. What is the average atomic mass of this element?
Construct a microstate table for a np3. I know that the # of microstates is going to be 6!/(3!(3!))= 20 microstates. really sure how to go about setting up a microstate table, could someone please explain
Find vapor pressure and density of liquid water at room temperature; state your source. Calculate the new vapor pressure of water at the same temperature when 740 torr of dry
calculate the apparent degree of dissociation of the nh4cl if the freezing point of this solution is -15.3oc?molal
sodium hydroxide (NaOH) pellets are dissolved in water to make 8.0 L of solution. What is the pH of this solution?
How many milliliters of a 235 mL solution of 1.5 M AlCl3 must be used to make 61 mL of a solution that has a concentration of 0.5 M Al3+?
The two electrodes Cr/Cr+3 and Sn/Sn+2 are combined to afford a spontaneous electrochemical reaction. The standard reduction potentials (volts) for Cr+3 and Sn+2 are -0.74 and -0.14, respectively. Calculate E° for this reaction.
important to dry the hexane extract phase containing the yellow and green pigment prior to performing column chromatography.
A solution contains 1.0 x 10-5 M Na3PO4. Calculate the minimum concentration of Ag+ that would cause precipitation of solid Ag3PO4.
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