1. Bromine-82 has a half-life of 36 hours. A sample containing Br-82 was found to have an activity of 1.4 x 105 disintegration/min. How many grams of Br-82 were present in the sample?
1. Bromine-82 has a half-life of 36 hours. A sample containing Br-82 was found to have an activity of 1.4 x 105 disintegration/min. How many grams of Br-82 were present in the sample?
2. Phospotus-32 is used in biochemical studies to follow the pathway taken by metabolites. Its half-life is 14.3 days. A vial containing 10µg of P-32 is accidentally spilled into a sink.
a) how long will it take P-32 in the drain to exhibit 65% of its original activity?
b) how many atoms of P-32 remains in the sink after 785 days?
3. Strontium-90 is a dangerous by product of automatic testing because it mimics the action of calcium in the body. It decay in two beta emissions to give zirconium-90(nuclear mass = 89.8824 g).
a) Write a balanced nuclear equation for the overall decay of Sr-90
b) Calculate Δm in grams when one mole of Sr-90 decays to Zr-90
c) How much energy in KJ is given off by the decay of 6.50mg of Sr-90?
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