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1. We have a solution of unknown substance dissolved in water at the temperature of 300 kelvin , this solution gives rise to osmotic pressure of 2.25 atm then calculate what will be the molality of the solution?
2. We have noted that water level rises to 62.4mL when a piece of metal of 48 grams is dropped into 50.0mL of H2O in a graduated cylinder. Determine the density of this metal?
What is the concentration of unknown acid solution? Write the neutralization reaction, balance it, name the products THEN Solve the problem above.
Determine the mass of sodium phosphate that yields 1.00 g of calcium phosphate precipitate.
Find the theoretical, percent yield and percent error of the reaction - Calculate the percent error of this reaction.
Why does the absolute refractory period occur and What is happening in the cell.
Chemical Kinetics - Determine the time taken by a reactant to reach a particular concentration
Integrals for some of the resonances in the 1H NMR spectrum are higher than they should be due to the shear number of hydrogens in this compound
using a sample of river water sample analyzed for total inorganic carbon ,The river pH= 7.1 and an inorganic C concentration of 6.97 mg C/L.c
Compute how many ml of C2H3NaO2(0.2 M) need to be added to 200 mL of 0.1 M CH3COOH to make a buffer of pH 5 and also find out what would be the total concentration of C 2 H 3 O 2 be in this (acetate + acetic acid) solution ?
An equilibrium mixture of this reaction(NH4HS(s)?NH3(g)+H2S(g)) at a certain temperature was found to have [H2S]= 0.350M and [NH3]= 0.276M .What is the value of the equilibrium constant (Kc) at this temperature.
How many gm of dry NH4Cl need to be combined to 2.30L of a 0.300M solution of NH3, to prepare a buffer solution of pH 8.85.
A solution, made by dissolving 62.07 g of a nonelectrolyte in 500 g of H2O, exhibits a freezing point of -1.86 °C. Determine the molecular weight of this nonelectrolyte compound? For water Kf = 1.86 °C m-1Kb = 0.51 °C m-1
Using a solution prepared by adding 467 mL of 0.400 M silver nitrate with 421 mL of 0.503 M sodium phosphate then determines what is the silver ion concentration in? Ksp of silver phosphate = 2.8 × 10-18
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