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A 10 mL sample of a solution of Pb(ClO3)2 was diluted with water to 170 mL. A 100 mL sample of the dilute solution was found to contain 0.021 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
determine How many formula units(formula un) of sodium iodide(NaI) are present in 9.54 grams of this compound and also calculate how many gms of sodium iodide are present in 6.07E+21 formula units of this compound.
A concentration of the pollutant NO2 in air of 3.00 ppm (m/v) may be lethal to humans. Will air that contains 1.9 x 10^-3g at NO2 per liter be lethal to humans?
What is the most appropriate temperature for storing your protein between purification steps? a) Room temperature b) 4° C c) -20° C d) -80° C
A 270- flask contains pure helium at a pressure of 755 . A second flask with a volume of 485 contains pure argon at a pressure of 727 torr.
Write one overall equation, using an alkali metal ion and a nitrate ion as spectator ions if needed, for the following net ionic equation: H+(aq) + OH-(aq) ? H2O(l)
What is the concentration (in M) of the nitrate ion when 18.4 mL of a 0.744 M solution of sodium nitrate is combined with 15.9 mL of a 0.734 M solution of copper(II) nitrate? Assume the volumes are additive.
what is the maximum pressure that will be attained in the tank before the plug will melt and release gas?
what is the oxidation number of the specified element in each compound or polyatomic ion: a)C in ZnCO3 b)Fe i Fe(NO3)2 c)Cl in ClF4^- d)S in S2O3^2-
Benzoyl peroxide, the substance most widely used against acne, has a half-life of 9.8 103 days when refrigerated. How long will it take to lose 7% of it potency (93% remaining)
Compute the mass of Trisodium phosphate required to remove all Ca^2+ ions from 2.50 Litres of the H 2 O sample?
An empty beaker has a mass of 42.889 g. 10.00 mL of NaCl solution are placed in the beaker. The mass of the beaker and solutionis 54.129 g.
Four kg of steam in a piston/cylinder device at 400kpa and 175C (448.15) undergoes a mechanically reversible, isothermal compression to a final pressure
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