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Problem- The half-lives of different radioisotopes are given in the table below. How long would it take (in minutes) for the amount of argon-44 to decrease from 88.0 mg to 11.0 mg?
argon-44;half life 12
lead-196;half-life 37
potassium-44;half-life 22
indium-117; half-life 43
Show all work, use additional paper if necessary.
When there are branches in either the acid or the alcohol, how do you name the ester formed from the reaction of these two? For example,
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The substance X is an element which has the elemental form of X(s) at 25oC. The standard enthalpy of formation of HXO4(g) is -818.0 kJ/mol at 25oC. The standard entropy of HXO4 (g) and X(s) are, respectively 175.8 J/mol•K and 30.70 J/(mol•K) at 25..
A potiential measurement in a paddy field acquiesce a reading of -278 mV verses the standard calomel reference electrode. Explain what is the pE value for this soil
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