Calculate the no. of moles in 50g of `H_2O` ( water)

Calculate the number of moles in 17g of hydrogen peroxide (H_(2)O_(2)) .

Calculate the number of moles of water (H_(2)O) present in 4.5 g of water.

Calculate the number of moles of water in 610 g BaCl_(2).2H_(2)O

Calculate the mass in grams of 0.2 mole of water (H_(2)O) . ( H = 1 , O = 16 )

(a) 2 Calculate the number of moles of water in 366 g BaCl_(2).2H_(2)O . (b) Calculate the value of X ( in terms of mole) if X=9.4 g "Phenol" +6.02xx10^(22) molecules phenol +0.2 "mole" phenol.

Calculate the enthalpy of vaporisation for water form the following: H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(g),DeltaH =- 57.0 kcal H_(2)(g) +1//2O_(2)(g) rarr H_(2)O(l),DeltaH =- 68.3 kcal Also calculate the heat required to change 1g H_(2)O(l) to H_(2)O(g)