Home
Class 12
PHYSICS
In a periodic table the average atomic m...

In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are `""_(12)^(24)Mg (23.98504u), ""_(12)^(25)Mg (24.98584u) and ""_(12)^(26)Mg (25.98259u)`. The natural abundance of `""_(12)^(24)Mg` is 78.99% by mass. Calculate the abundances of other two isotopes.

Text Solution

Verified by Experts

`""_(12)^(25)Mg:9.3%, ""_(12)^(26)Mg:11.7%`
Promotional Banner

Similar Questions

Explore conceptually related problems

The three stable isotopes of neon: ""_(10)^(20)Ne,""_(10)^(21)Ne and ""_(10)^(22)Ne have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.

(a) Two stable isotopes of lithium ""_(3)^(6)Li and ""_(3)^(7)Li have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium. (b) Boron has two stable isotopes, ""_(5)^(10)B and ""_(5)^(11)B . Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u . Find the abundances of ""_(5)^(10)B and ""_(5)^(11)B .

Calculate the mas of Magnesium required to completely react with 250cm^(3) of 0.1 MHCl. Atomic mass of Mg=24 Or (Internal choice) 100cm^(3) of a solution of HCl completely neutralizes 25cm^(3) of 0.1 M NaOH. Calculate the mass of HCl present in 100cm^(3) .