A 100g sample of Carbon-14 has a half-life of 5 years. How much Carbon-14 is left after 10 years?

 The carbon-14 left after 10 years is 25 g

Explanation:

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

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) for rate constant

b) for amount left after 10 years

Thus carbon-14 left after 10 years is 25 g

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of carbon is as shown here in the image.