Calculate the formula unit masses ofZnO,`Na_2O, K_2CO_3`, given atomic masses of Zn = 65u, Na = 23u, K = 39u, C =.12u, and O = 16u.

Calculate the molecular masses of H_2,O_2, Cl_2,CO_2, CH_4, C_2H_6,C_2H_4,NH_3,CH_3OH

Three electrolytic cells A, B and C containing electrolytes ZnSO_4 , AgNO_3 and CuSO_4 respectively were connected in series. A steady current of 1.5A was passed through them. 1.45g Ag were deposited at the cathode of cell B.What mass of copper and zinc were deposited? (Atomic mass of Cu = 63.5u, Zn = 65.3u, Ag = 108u.)

Which has more number of atoms, 100 grams of sodium or 100 grams of iron(given, atomic mass of NA=23u, Fe = 56u)?

The atomic mass of sodium is 23 u. What is the number of moles in 46 g sodium?

Urea [NH_2)_2CO] forms an ideal solution in water. Calculate the vapour pressure of an aqueous solution containing 5% by mass of urea at 298K. At 298K, vapour pressure of water is 23.75 mm Hg.

Three electrolytic cells A, B and C containing electrolytes ZnSO_4 , AgNO_3 and CuSO_4 respectively were connected in series. A steady current of 1.5A was passed through them. 1.45g Ag were deposited at the cathode of cell B. How long did the current flow?(Atomic mass of Cu = 63.5u, Zn = 65.3u, Ag = 108u.)