Example 7 Phosphorus-32, a radioisotope used in the treatment of leukemia, has a half-life
of 14.3 days. If a sample contains 8.0 mg of phosphorus-32, how many milligrams
of phosphorus-32 remain after 42.9 days?​

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6