Calculate : `21xx95xx0`

Evaluate : 95xx96

21xx22xx23

Using suitable identity evaluate the 105 xx 95

Calculate F^- in a solution saturated with respect of both MgF_2 and SrF_2. K_(sp) (MgF_(2)0=9.5 xx 10^(-9), K_(sp) (SrF_(2))=4 xx 10^(-9) .

Calculate the energy of an a-particle if in a collision of this particle with gold nucleus, the distance of closest approach is 4.95 xx 10^(-12) m.

The kinetic energy of a molecule of hydrogen at 0^(@) is 5.64 xx 10^(-21) J . Calculate Avogadro's number. Take R = 8.31 xx J "mole"^(-1) K^(-1)

Calculate the degree of ionisation and concentration of H_(3)O^(+) ions in a solution of 0.01 M formic acid (K_(a)= 2.1 xx 10^(-4))