A60.0-g sample of fermium-253 was placed in a sealed vessel 9.0 days ago. only 7.5 g of this isotope is now left. what is the half-life of fermium-253?

3.02 days

Explanation: This is a type of radioactive decay and all the radioactive process follow first order kinetics.

Equation: Expression for rate law for first order kinetics is given by:

where,

k = rate constant

t = time taken for decay process

a = initial amount of the reactant

(a - x) = amount left after decay process

Putting values in above equation, we get:

To calculate the half life, we use the formula:

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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