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the water solubility of L-alanine is 127g/L at 25 degrees celsius, what is the water solubility of D-alanine at 25 degrees celsius?
a sample of argon gas is at a pressure of 1.24x10^4 kpa and a temperature of 24c in a rigid 25-L tank. How many moles of argon does this tank contain?
If 3.98 g of copper was recovered and you started with 9.10 g of copper (II) chloride, then what is the percent yield of the reaction ?
Consider the following reaction: NH4HS(s) NH3(g) + H2S(g) An equilibrium mixture of this reaction at a certain temperature was found to have [NH3]=.278M and [H2S]=.355M.
an unknown liquid with boiling range of 179-181 C is insoluble in water, gives a blue green suspension with chromic acid and immediately forms a separate layer when shaken with Lucas' reagent.
A 0.2088g sample of an unknown monprotic acid is titrated with 22.10 ml of 0.1000 mol/L KOH. The pH of the solution after the addition of 22.10 ml of base is 5.02. What is the Ka for the acid?
calculate the molecular mass of a solute with 8.02 grams of solute in 861 grams of water lower the freezing point to -.430 degree Celsius
A certain quantity of a gas occupies 61.3 mL at 68C. If the pressure remains constant, what would the volume of the gas be at 17C?
A sample of neon has a volume of 270 mL when it is at a pressure of 831 mmHg. What will be the volume when the pressure is increased to 1238 mmHg?
For an acid-base reaction, what is the reacting species, that is, the ion or molecule that appears in the chemical equation, in the following acids?
Compute the number of moles of sodium hydroxide ( NaOH ) in 23.75cm 3 of 0.150moldm -3
A sample of nitrogen gas in a 4.7-L container at a temperature of 28°C exerts a pressure of 3.6 atm. Calculate the number of moles of gas in the sample.
2ZnS + 3O2 = 2ZnO + 2SO2 how many moles of Zno are produces when 32 gms of oxygen is allowed to react with an excess of ZnS?
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