Potassium sulphate `(S = 18.38%)`and potassium selenate `Se = 35.75%)` are isomorphous. At wt of S = 32 Find the atomic wt. of Se.

A sulphate of a metal is isomorphous with ZnSO_(4)*7H_(2)O . In this salt, the percentage of the metal is 9.75. what is the atomic mass of the metal?

0.316 g of an organic compound, after heating with fuming nitric acid and barium nitrate crystals in a sealed tube gave 0.466 g of the precipitate of barium sulphate. Determine the percentage of sulphur in the compound. (Atomic masses : Ba = 137, S = 32, O = 16, C = 12, H = 1).

An element (X) reacts with KOH to form a salt. The salt is isomorphous with potassium permanganate (KMnO_(4)) . The oxide of the element X contains 61.2% of oxyge. Determine the formula of the oxide and atomic mass of X.

In the estimation of S by Carius method, 0.468 g of an organic sulphur compound afforded 0.68g barium sulphate. Find out the % of S in the given compound.

A peroxidase'enzyme isolated from human red blood cells was found to contain 0.29% selenium. What is the minimum molecular of-enzyme? [At wt. of Se = 78.96]

(C_(2)F_(4))_n s a polymeric substance where n is a large number. It is prepared by polymerisation of C_(2)F_4 in presence of sulphur catalyst. The final product is found to contain 0.012% of S. find the value of n if the polymeric molecule contains three S-atoms.

Water drops from a height of 50 m in a waterfall. Find out the rise in temperature of water, if 75% of its energy is converted into heat and absorbed by water. (J = 4.2 xx 10^(7) erg cdot cal^(-1) , g = 9.8 m cdot s^(-2))

Calculate the amount of sulphuric acid (75% by weight) which is needed to decompose 0.5 mole of calcium carbonate (Ca=40, C=12, S=32).