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

The amount of carbon-14 left after 10 years is 25 g

Explanation:

Formula used :

where,

a = amount of reactant left after n-half lives = ?

= Initial amount of the reactant = 100 g

n = number of half lives =

Putting values in above equation, we get:

Therefore, the amount of carbon-14 left after 10 years is 25 g

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally