Brass is an alloy of Cu-Zn. A sample of brass weighing 6.0 g, when treated with excess of dil. H2SO4 gives 328 mL of dry H2 at 27°C and 760 mm pressure. What is the percentage of Cu by weight in the alloy? (Atomic mass of Zn = 65.4 gm)

In the electrolysis of aqueous solution of NaOH , 2.8 litre of oxygen at NTP liberated at anode. How much Hydrogen was liberated at cathode ?

We can calculate volume of hydrogen by applying first law of faraday's:

On passing 3 faradays of electricity through three electrolytic cells connect in series containing Ag+ , Ca+2 and Al+3 ions respectively , the molar ratio in which three metals ions are liberated at the electrode is

We are find molar ratio of metal ions by applying faraday's first law of electrolysis

A mixture of FeO and Fe2O4 when heated in air to constant weight gain 5% in its weight, The % of FeO in sample is?

1 ml of gaseous aliphatic compound CxHyOz is completely burnt in an excess of O2 and cooled to room temperature. The contraction in volume is..

Contraction of volume is volume of gaseous mixture taken minus , volume of gaseous products obtained in a combustion reaction. In combustion of Hydrocarbon water obtained at room temperature is in liquid state hence it's volume ignored in calculation of volume contraction.

Related Questions:

(1) 1 ml of gaseous aliphatic compound CnH3nOm is completely burnt in an excess of O2 and cooled to room temperature. The contraction in volume is..

(2) 1 ml of gaseous aliphatic compound CxHyOz is completely burnt in an excess of O2 and cooled to room temperature. The contraction in volume is..

(3) 50 ml of C3H8 is mixed with 300 ml of oxygen for complete combustion find out the final volume and volume concentration.