Boron has two stable isotopes `"_5^10B` and `"_5^11B`. There respective masses are 10.01294 u and 11.00931 u and the atomic mass of boron is 10.811 u. Find the abundances of `"_5^10B` and `"_5^11B`.

Boron has two stable isotopes, "_5^10B and "_5^11B . 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 "_5^10B and "_5^11B .

B has two isotopes 10B (19%) and 11B( 81%) . What is the atomic mass of B .

Two stable isotopes of lithium "_3^6Li 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.

The three stable isotopes of neon: "_10^20 Ne , "_10^21Ne and "_10^22Ne 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.

Carbon occurs in nature in the form of two isotopes with atomic mass 12 and 13 respectively. If average atomic mass of carbon is 12.011 u , what is the % abundance of the two isotopes ?

The radionuclide "^11C decays according to "_6^11C rarr "_5^11B + e^+ + v : T_(1/2) = 20.3 min .The maximum energy of the emitted positron is 0.960 MeV. Given the mass values: m ( "_6^11C ) = 11.011434 u and m ( "_6^11B ) = 11.009305 u, calculate Q and compare it with the maximum energy of the positron emitted.

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 "_12^24Mg (23.98504u), "_12^25Mg (24.98584u) and "_12^26Mg (25.98259u). The natural abundance of "_12^24Mg is 78.99% by mass. Calculate the abundances of other two isotopes.

Let a and b be the roots of the equation x^2-10 c x-11 d=0 and those of x^2-10 a x-11 b=0 are c and d and then find the value of a+b+c+d

Three conductivity cells A, B and C containing solutions of zinc sulphate, silver nitrate and copper sulphate respectively are connected in series. A steady current of 1.5 amperes is passed through them until 1.45 g of silver is deposited at the cathode of cell B. How long did the current flow ? What mass of copper and what mass of zinc got deposited in their respective cells ? (Atomic mass : Zn = 65.4 u, Ag = 108 u, Cu = 63.5 u)