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Q1. The concentration of Pb+ in sample of wastewater is to be determined by using gravimetric analysis? to a 1000.0 ml sample of the waste water is added an excess of sodium sulfide, forming insoluble lead II sulfide(239.266g/mol) according to the balance equation given below. the solid leadII sulfide is dried, and it's mass is measured to be 0.1209g. what was the contraction of Pb2+ in the original wastewater sample? Pb2+(aq) + Na2S(aq) ---> PbS(s) + 2Na+(aq)
A 5.325g sample of methyl benzoate, a compound found in perfumes, was found to contain 3.758g of carbon, 0.316g of hydrogen, and 1.1251g of oxygen.
consider the combustion of ethylene c2h4 g 3 o2 g ------gt 2 co2 g 2 h2o g. if the concentration of c2h4 is
Assuming that the process is working as intended, draw and label the flowchart, do the degree-of-freedom analysis, and estimate the molar flow rate (lb-mole/h) of the humidified outlet air
A solution is prepared by dissolving 6.00g of an unknown nonelectrolyte in enough water to make 1.00L of solution. The osmotic pressure of this solution is .750atm at 25.C. What is the molecular weight (g/mol) of the unknown solute
draw correlation diagram the HOMO of allyl anion and the LUMO of ethylene and comment on the symmetry match of the two.
Consider the reaction of 5.0 moles of CS2 and 3.0 moles of NaOH according to the following reaction 3 CS2 + 6 NaOH -> 2 Na2CS3 + Na2CO3 + 3 H2O.
A certain second-order reaction ( B--> product) has a rate constant of 1.50×10?3 M-1*S-1 at 27C and an initial half-life of 214s. What is the concentration of the reactant B after one half-life
How many grams of caffeine (C8H10N4O2) are present in one cup of coffee that contains 8.98 × 1021 caffeine molecules?
1.0 M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity
what is the ground-state electron configuration of
If the fluid inside a tree is about 0.1 M more concentrated in solute than the groundwater that bathes the roots, how high will a column of fluid rise in the tree at 26°C? Assume that the density of the fluid is 1.0 g/cm3. (The density of mer..
10ml of 0.1m hno2 nitrous acid ka4.0x10-4is titrated with a .01m koh solution. after 10ml of the koh solution is added
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