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The half life of the radioisotope^ 158,47Eu is 1.0 hr.the decay of a 16.0g sample of the isotope to 1.25g required how many hours
How many mL of 0.425 M NaOH are needed to react completely with 25.0 mL of 0.250 M Fe Cl3 solution? FeCl3 aq + 3NaOH arrow to Fe(OH)3 aq +3NaCl aq
A solution of HCl has a pH of 2.50. How many grams of HCl are there in 0.250 L of this solution? How many grams of HCl are in 250mL of an HCl solution that has twice this pH
how to interpret hnmr spectra of 1-naphthol, why are the signals that occur more upfeild occuring more up feild. and likewise why are the signals occuring more downfield occuring downfield?
A sample of ammonia gas is completely decomposed to nitrogen andhydrogen gases over heated iron wool. If the total pressure is 603mmHg, calculate the partial pressure of N2 and H2
How many mL of 2.56M solution of KCl are required to prepare 500.0 mL of 1.33 L of a 0.175M KCl solution
An element has three naturally occurring isotopes, calculate the percent abundance and the atomic mass
An alkyne of six carbon atoms gives the same single product in its reaction either with BH3 in THF followed by H2O2 /OH-, or with H2O/Hg2
For the following reaction: Fe(OH)2 + H3PO4 ----> Fe3(PO4)2 + H2O [Unbalanced] In a reaction, 3.20 g of Fe(OH)2 is treated with 2.50g H3PO4. If 3.62g of Fe3(PO4)2 is produced in the reaction, what is the percent yield for the reaction?
Draw all of the carbocation resonance structures that result when the tosylate ion leaves from 1-(tosylmethyl)cyclohexa-1,3-diene. Input the radical lone electrons.
Sodium bicarbonate is often used as an antacid to neutralize excess hydrochloric acid in an upset stomach. What mass of hydrochloric acid (in grams) can be neutralized by 2.3g of sodium bicarbonate?
The nuclear mass of 141Ba is 140.883 amu. Calculate the binding energy per nucleon for 141Ba.
A tank of 10 m3 volume contains an ideal gas (CP=30 J/mol-K) at T=298 K and P=5 bar. If gas from the tank is allowed to flow through a reversible device and exhaust to the atmosphere at P=1 bar.
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