Question

In: Physics

Sally has 100 g each of iodine-131 and radon-222. How much of each of these will...

Sally has 100 g each of iodine-131 and radon-222.

How much of each of these will remain after 32 days?

What will I-131 decay to and Rn-222 decay to?

Expert Solution

a) (i) Let the amount of remaining iodine-131 is m_ir.

The mass of the iodine m_i=100 g.

We know the half life of iodine-131 is t_1/2=8 days.

Let the number of half life is in 32 days is n.

The number of half life is in 32 days is

The amount of remaining iodine-131 is

6.25 g of iodine-131 will remain after 32 days .

(ii)

The iodine-131 decay to xenon-131.

b) (i) Let the amount of remaining radon-222 is m_rr.

The initial amount of radon-222 is m_r=100 g.

The half-life of radon-222 is t_1/2=3.8 days.

Let the number of half life is in 32 days is n.

The number of half life is in 32 days is

The amount of remaining radon-222 is

The amount of remaining radon-222 is 0.2917497972 g or 0.29 g approximately.

(ii)

The radon-222 decay to Polonium-218.

genius_generous answered 1 year ago

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