13.5 gmof aluminium when changes to `Al^(+3)` ion in solution, will lose: `[Ai = 27, N_(A) = 6 xx 10^(23)]`

Molar mass of electron is nearly : (N_(A) = 6 xx 10^(23))

6.02 xx 10^(20) molecules of urea are present in 100 mL of its solution. The concentration of urea solution is (Avogadro constant, N_(A) = 6.02 xx 10^(23)mol^(-1))

1.19gm mixture of Cu, Zn and Al contains 50u% copper by weight and 3 xx 10^(21) atoms of zinc. Find gram atoms of aluminum in given mixture? (At. Mass of Al= 27, Cu=63.5, Zn=65.0) N_(A) = 6 xx 10^(23)

Freshly prepared aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0.25M of ammonium chloride and 0.05M of ammonium hydroxide. Calculate the concentration of aluminium and magesium ions in solution (K_(b) NH_(4)OH = 1.8 xx 10^(-5), K_(sp) Mg(OH)_(2) = 6 xx 10^(-10), K_(sp) Al(OH)_(3) = 6 xx 10^(-32) .

One atom of an element X weighs 6 xx 10^(-23) gm . Number of moles of atoms in 3.6 kg of sample of X will be : (N_(A) = 6 xx 10^(23))

One atom of an element X weighs 6 xx 10^(-23) gm . Number of moles of atoms in 3.6 kg of sample of X will be : (N_(A) = 6 xx 10^(23))

A detergent (C_(12)H_(23)SO_(4)^(-)Na^(+)) solution becomes a colloidal sol at a concentration of 10^(-3) M.On an average 10^(13) colloidal particles are present in 1 mm^3 What is the average number of ions are contain in one colloidal particle (micelle)? [Given : N_A = 6 xx 10^(23)]

Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0.25 mol L^(-1) of NH_4Cl and 0.05(M) of ammonium hydroxide. Calculate the concentration of aluminium and magnesium ions in solution. K_b(NH_4OH)=1.8xx10^(-5),K_(sp)[Al(OH)_3]=6xx10^(-32) K_(sp)[Mg(OH)_2)]=8.9xx10^(-12)

Number of electrons in 36mg of ._8^(18)O^(-2) ions are : (Take N_(A) = 6 xx 10^(23))