A 0.50g sample of rock was found to have `2.5 xx 10^(-6)` mol of `._(19)^(40)K (t_(1//2)=1.3 xx 10^(9) "yr")` and `7.5 xx 10^(-6)` mol of `._(20)^(40)Ca` . How old is the rock?

0.50 g sample of rock was found to have 2.5 xx 10^-6 mol of K "_(19)^(40)(t_(1/2) = 1.3 xx 10^9 Yr) and 7.6 xx 10^-6 mol of Ca "_(20)^(40) . How old is the rock?

A sample of U^(238) (t_(1//2)= 4.5 xx 10^(9) yrs) is found to contains 23.8g U^(238) and 20.6g Pb^(206) , the age of ore is

PCI_(5), PCI_(3) and CI_(2) are in equilibrium at 500 K in a closed container and their concentration are 0.8 xx 10^(-3) " mol" L^(-1) " and " 1.2 xx 10^(-3) "mol" L^(-1) " and " 1.2 xx 10^(-3) "mol" L^(-1) respectively. The value of K_(c) for the reaction PCI_(5) (g) hArr PCI_(3) (g) + CI_(2) (g) will be

What is the pH of 10^(-3) M ammonia cyanide solution, if K_(HCN)=7.2 xx 10^(-11) and K_(NH_(3))=1.8 xx 10^(-5)mol L^(-1) ?

Identify the reaction order form each of the following rate constants: a. k = 7.06 xx 10^(-3) mol L^(-1) s^(-1) b. k = 5.6 xx 10^(-5) s^(-1) c. k = 1.25 xx 10^(-2) mol^(-1)l s^(-1) d. k = 1.25 xx 10^(-2) mol L^(2)s^(-1) e. k = 5.0 xx 10^(-6) atm^(-1)s^(-1)

Identify the reaction order form each of the following rate constants: a. k = 7.06 xx 10^(-3) mol L^(-1) s^(-1) b. k = 5.6 xx 10^(-5) s^(-1) c. k = 1.25 xx 10^(-2) mol^(-1)l s^(-1) d. k = 1.25 xx 10^(-2) mol L^(2)s^(-1) e. k = 5.0 xx 10^(-6) atm^(-1)s^(-1)

A solution contaning 2.7 xx 10^(-3) mol of A^(2+) "ion required" 1.6 xx 10^(-3)mol of MnO_(4)^(2-) for the oxidation of A^(2+) "to" AO_(3)^(-) the medium is: