Copper sulphate crystals contains 25.45 % Cu and 36.07 % `H_(2)O`. If the law of constant composition is true, calculate the weight of copper required to obtained 40 g of crystalline copper sulphate.

Calculate the amount of 50% H2SO4 required to decompose 25g of marble .

A sample of calcuium carbonate (CaCO_(3)) has the following percentage composition: Ca=40%, C=12%, O=48% If the law of constant proportions is true. Then the weight of calcium in 4 g of a sample of calcium carbonate obtained from another source will be

Calculate the molecular weight of of following compound : copper sulphate crystals (CuSO4. 5H2O)

0.246 g of an organic compound gave 0.198 g of CO_2 and 0.101 g of H_2O on complete combustion calculate the percentage composition of Carbon and Hydrogen.

The sulphate of a metal M contains 9.87% of M , This sulphate is isomorphous with ZnSO_(4).7H_(2)O . The atomic weight of M is

During the discharge of a lead storage battery, the density of sulphuric acid fell down from 1.294 to 1.139 g/ml. Sulphuric acid of density 1.294g/ml is 39% H_2SO_4 by weight and that of density of 1.139 g/ml is 20% H_2SO_4 by weight. The battery holds 3.5 L of acid and the volume remains practically constant during discharge. calculate the number of ampere hours for which the battery must have been used. The charging and discharging reactions are: Pb^(2+)+SO_4^(2-)LeftrightarrowPbSO_4+2bare(Charging) PbO_2+4H^(+)+SO_4^(2-)+2bareLeftrightarrowPbSO_4+2H2O(Discharging) .

What is the coordination entity formed when excess of aqueous KCN is added to the aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H_2S (g) is passed through this solution .

Weight of copper oxide obtained by treating 2.16 g metallic copper with nitric acid and subsequent ignition was 2.70 g. In another experiment, 1.15 g of copper oxide on reduction yielded 0.92 g of copper. Show that these results illustrate the law of definite proportions.

Three conductivity cells A, B and C containing solutions of zinc sulphate, silver nitrate and copper sulphate respectively are connected in series. A steady current of 1.5 amperes is passed through them until 1.45 g of silver is deposited at the cathode of cell B. How long did the current flow ? What mass of copper and what mass of zinc got deposited in their respective cells ? (Atomic mass : Zn = 65.4 u, Ag = 108 u, Cu = 63.5 u)

Gasoline has an enthalpy of combustion 24000 kJ/mol gallon. When gasoline burns in an automobile engine, approximately 30% of the energy released is used to produce mechanical work. The remainder is lost as heat transfer to the engine's cooling system. As a start on estimating how much heat transfer is required, calculate what mass of water could be heated from 25^(@)C to 75^(@)C by the combustion of 1.0 gallon of gasoline in an automobile? (Given : C(H_(2)O)=4.18 J//g^(@)C ) a) 34.45 kg b) 80.383 kg c) 22 kg d) 224 kg