Obtain the moles of substances in the following.
a. 3.43 g of C b. 7.05 g `Br_2`
c. 76 g `C_4H_(10)` d. 35.4 g `Li_2 CO_3`
e. 2.57 g As f. 7.83 g `P_4`
`41.4 g N_2H_4` h. 153 g `Al_2(SO_4)_3`

Amount of glucose in ORS 1. 12 g 2. 10 g 3. 15 g 4. 20 g

Let's find the G.C.D of the following expressions. a^3 - 4a^2 + 4a, a^2 + a - 6, a ^3 - 8

If G is the centroid of triangle A B C ,t h e n vec G A+ vec G B+ vec G C is equal to a. vec0 b. 3 vec G A c. 3 vec G B d. 3 vec G C

If U = { a, b, c, d, e, f, g, h} , find the complements of the following sets : C = {a, c, e, g}

Equilibrium constants are given (in atm) for the following reactions at 0^@C (a) SrCl_2.6H_2O(s) iff SrCl_2.2H_2O(s) + 4H_2.O(g), K_p = 6.89 xx 10^(-12) (b) Na_2HPO_4.12H_2O(s) iff Na_2HPO_4. 7H_2O(s) +5H_2O(g), K_p = 5.25 xx 10^(-13) (c) Na_2SO_4. 10 H_2O(s) iff Na_2SO_4(s) + 10H_2O(g), K_p = 4.08 xx 10^(-25) The vapour pressure of water at 0^@C is 4.58 torr. Calculate the pressure of water vapour in equilibrium at 0^@C with each of (a), (b) and (c)

If U = { a, b, c, d, e, f, g, h} , find the complements of the following sets : D = { f, g, h, a}

Calculate the total number of (a) molecule, (b) oxygen atoms and (c ) neutrons in 4.4 g of CO_2 (g).

Justify the following reactions are redox reactions : 4NH_(3)(g)+5O_(2)(g)to4NO(g)+6H_(2)O(g)

Delta H- Delta U for the reaction C_3H_8(g) +SO_2 (g) = 3CO_2 (g) + 4H_2O (g) .

Calculate the enthalpy of combustion of ethylene . Given : C_(2) H_(6) (g) + (7)/(2) O_(2) (g) to 2 CO_(2) + 3 H_(2)O (l) , Delta H = = 1562 kJ* mol^(-1) H_(2) (g) + (1)/(2) O_(2) (g) to H_(2) O (l) , Delta H = -286 kJ * mol^(-1) C_(2) H_(4) (g) + H_(2) (g) to C_(2) H_(6) (g) , Delta H = -32 kJ * mol^(-1)