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Gallium-68 decays by positron emission, with a half-life of 68.3 min. How much 68Ga remains from a 10.0 mg sample after 683 min?
a) 1.0 mg
b) 1.0 X 10-10 mg
c) 9.8 X 10-3 mg
d) 2.2 X 10-2 mg
e) 6.1 X 10-7 mg
Solution of Barium chlorate with a solution of Silver fluoride
the flask was filledto the calibration mark with water. What were the equilibrium concentrations of H3PO4,H2PO-, HPO-2, PO-3, and H+ in the resultant solution. Ka1 = 7.1x10-3, Ka2 = 6.3x10-8, and Ka3 = 4.2x10-13 for H3PO4.
Describe the procedure for preparation of 250 cublic cm of aqueous sulphamic acid of accurately known concentration.
the fired crucible is handled with oily fingers before its mass measurement. subsequently in part b.1 the oil from the
Show the product expected from the reaction of the grignard reagent formed from propyl bromide with methyl propanoate
What is the product of Furfural + 3-Pentanone and NaOH? (there are 2 possible combinations.)Also how could you alter the reaction conditions to obtain primarily one product or the other
question a 1.71 mol sample of ar gas is confined in a 41.9 liter container at 25.7 c. if the volume of the gas sample
a gas occupying a volume of 428 ml at a pressure of 0.970 atm is allowed to expand at constant temperature until its
No carbon atom in the structure of Y has more than one oxygen atom bonded to it, and Y can exist in two (and only two) stereoisomers forms. What are the structures of these forms of Y?
Claisen reactions use a stoichiometric amount of base and do not polymerize, unlike aldol reactions that use a catalytic amount of base and can polymerize.
Cd2+, Co2+ is saturated with H2S at a pH of 3.00. Which metals form a sulfide solid? [H2S]sat=0.10 and Ka1= 1.3e-7 and Ka2=8.5e-14
The melting point of a newly discovered element is 1935.4°F. Express this temperature in degrees Celsius.
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