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An old container of KOH has been found in the chemistry lab. A 4.00 g sample of this impure KOH is dissolved in 30.0 mL of 2.500 M HCI, transferred to a 250 0 mL volumetric flask and diluted to the mark with distilled water. A 15.00 mL sample of the resulting solution is pipetted into an Erlenmeyer flask and titrated with 4.32 mL of standardized 0.120 MNaOH. Determine the percent purity of the sample of KOH found in the lab (Molar mass of KOH = 56.1 g/mol).
two naturally occurring isotopes, Re-185 (mass = 184.935 amu) and Re-187 (mass = 186.956 amu). Calculate the percent abundances of the isotopes of rhenium.
calculate the volume of 1.420 M NaOH required to titrate 38.70 ml of a 1.50 M H3PO4 solution
A professional emergency responder should be concerned about the following routes of radiation exposure for a person on scene and a person downtown?
Given that the nuclidic masses of 238U = 238.0508 amu and an a particle = 4.0026 amu, calculate the mass of 234Th in units of g/mol.
Explain why a compound with a phosphate group whose free energy of hydrolysis is more negative can transfer phosphate to another compound to make a phosphorylated product whose free energy of hydrolysis is less negative.
a 1.80-g sample of a large biomolecule was dissolved in 21.0 g of carbon tetrachloride. the boiling point of this
Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin plastic divider. When the divider is broken
Calculate the entropy change of the surroundings associated with this heat transfer. Assume the weight of an average adult is 80.0 kg.
But a3.00 g sample of Mg dissolves in nitric acid to give 18.3 g of magnesium nitrate, which gives 4.98 g of MgO when heated to 1000 degrees Celsius. These results illustrate which law, theory or hypothesis?
A fossil is found to have a 14C level of 75.0% compared to living organisms. How old is the fossil
Explain how mass effects act to lower the carbonyl frequency, as well as how inductive and hyperconjugation effects act to raise the carbonyl frequency
For the reaction 2CH2O(g) + O2(g) ? 2HCOOH(l), if 4.19 × 1022 molecules of formaldehyde (CH2O) react with excess oxygen, what is the theoretical yield of formic acid (HCOOH)
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