Calculate the entropy change in surroundings when 1.0 mol of `H_2O` (l) is formed under standard conditions. Given `Delta_fH^@ = -286 kJ mol^-1`

Calculate DeltaS_(sun) . when one mole of methanol (CH_3OH) is formed from its elements under standard conditions if Delta_tH^@ (CH_3OH) = - 238.9 kj mol(-1) .

What is the free energy change in dissolving one mole of NaCl with its lattice energy and hydration energy of -777.8 kJ mol^-1 and -774 kJ mol^-1 respectively at 25^@ C ? (Given: DeltaS=0.043 kJ K^-1 mol^-1 )

Calculate the free energy change for the following reaction at 300 K. 2CuO_((s)) rarr Cu_(2)O_((s))+(1)/(2)O_(2(g)) Given Delta H = 145.6 kJ mol^(-1) and Delta S = 116.JK^(-1) mol^(-1)

The solubilling of N_2 gas in water at 25^@C and 1 bar is 6.85xx10^(-4) mol L^(-1) . Calculate henry's law constant Molarity of N_2 gas dissolved in water under atmospheric conditions when partial pressure of N_2 in atmosphere is 0.75 bar.

Calculate the pressure in atm of 1.0 mol of helium in a 2.0 dm^3 container at 20.0^@C .

The bond energy of an O-H bond is109 kcal mol^(-1) . When a mole of water is formed