Answer:
After 4 days 10 g will left
After 8 days 5 g will left.
Explanation:
Given data:
Half life of isotope = 4 days
Total amount of sample = 20 g
Amount left after each time period = ?
Solution:
The half life of radioactive isotope is 4 days it means after 4 days the amount left will be half of total amount.
20 g/2 = 10 g
The half amount which is left will be consume in next 4 days and remaining amount will be,
10 g/2 = 5 g
After 4 days 10 g will left
After 8 days 5 g will left.
it is still available please let us know
Decomp. ~ 2H2O —-> 2H2 + O2
Single Disp. ~ AgNO3 + Cu —> CuNO3 + Ag
Double Disp ~ Pb(NO3)2(aq) + 2KI(aq) -> 2KNO3(aq) + PbI2(s)
Combustion ~ CH4 + O2 —> CO2 + 2H2O
Synthesis ~ 2Mg + O2 —> 2MgO
