The mass of the isotope will remain after 5.7 days is 0.69 gm.
What is isotope?
Isotopes are atoms that have variable numbers of neutrons but the same number of protons. They differ in mass and hence in physical qualities, although having nearly identical chemical properties.
What is mass?
Grammes can be used to measure lower quantities instead of kilogrammes, which is the standard SI unit for mass (g). A balance would be used to quantify mass.
t1/2 = 4 days , k = 0.693/t1/2 = 0.693/4 = 0.17325
t = 5.7 days
t = ( 1/k) ln(a/a-x)
5.7 = (1/0.17325) ln ( 1.85/1.85-x)
2.684582 ( 1.85-x) = 1.85
x = 1.161
amount left or remained = a-x = 1.85-1.161 = 0.689 gm = 0.69 gm
Therefore, the mass of the isotope will remain after 5.7 days is 0.69 gm.
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