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What mass of ammonium chloride, NH4Cl, (Ka = 5.6 x 10^-10) must be added to exactly 500mL of 0.10M NH3 solution to give a solution with a pH of 9.00
How many grams of aluminum oxide are produced when 50.3g aluminum react, When 0.510 mole aluminum is reacted in a closed container with 7.90g oxygen, how many grams of aluminum oxide can form?
If the absorbance of one of your samples is off scale, what is the most likely problem?
In analyzing a general unknown containing ions from several of the cation groups, a student treated the decante from Group II with Na3Co(NO2)6 and observed that a precipitate formed.
Lindane is a toxic insecticide that causes dizziness and diarrhea in humans. Find the molecular formula for lindane given its percent composition:
Calculate the approximate amount of unknown acid to use such that it would require about 15 mL of 0.05M NaOH to reach the endpoint.
3H2+N2=How many grams of NH3 can be produced from 3.91g of N2?
A flask has a mass of 78.23 g when empty and 593.63 g when filled with water. When the same flask is filled with concentrated sulfuric acid, H2SO4, its mass is 1026.57 g
The pI can be estimated fairly accurately (within 0.1 or 0.2 pH units) from the pK values of all the proton dissociable groups in the peptide. Using pK values from the table at the right, estimate the pI value of the following hexapeptide
If 26 of 6.6 was spilled, what is the minimum mass of that must be added to the spill to neutralize the acid?
would a given amount of flourine react with different masses of the two hydrogen isotopes? Does this violate the law of definite proportions.
Dissolving 3g of an impure sample of CaCO3 in HCl produces .656 L of CO2, measured at 293 K and 1.04 atm. What is the percent by mass of the CaCO3 in the sample?
calculate the total amount of heat energy that must be removed to convert 34.0g of steam to water at 25 Celsius
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