The isotope A has a half-life of 165 days. The isotope B has a half-life of 330 days. Which statement about these two isotopes is false? a) One year represents slightly more than two half-lives of a sample of the calcium isotope.

b) Almost all of 100 g of the calcium isotope will decay in one year's time.

c) 100 g of the vanadium isotope will decay to somewhat less than 50 g in a year.

d) The calcium isotope decays at twice the rate of the vanadium isotope.

e) All of these statements are true

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How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

How do cfcs cause ozone depletion? how do cfcs cause ozone depletion? ultraviolet radiation breaks down cfcs, molecules containing chlorine. chlorine then breaks one oxygen atom away from ozone, leaving behind a paired oxygen molecule. ultraviolet radiation breaks down cfcs, molecules containing chlorine. chlorine then breaks two oxygen atoms away from ozone, leaving behind a paired oxygen molecule. ultraviolet radiation creates cfcs, molecules containing chlorine. chlorine then breaks two oxygen atoms away from ozone, leaving behind a paired oxygen molecule. ultraviolet radiation creates cfcs, molecules containing chlorine. chlorine then breaks one oxygen atom away from ozone, leaving behind a paired oxygen molecule.

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.