CaCO 3 contains __________ percent of Ca by weight.

A very dilute solution is prepared by dissolving 'x 1 ' mole of solute in 'x 2 ' mole of a solvent. The mole fraction of solute is approximately equal to

Assuming that CO 2 obeys perfect gas law, calculate the density of CO 2 (in kg/m 3 ) at 263°C and 2 atm.

Heat capacity of air can be approximately expressed as, C p = 26.693 + 7.365 x10 -3 T , where, C p is in J/mole. K and T is in K . The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is

Equal masses of CH 4 and H 2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is

Density of carbon dioxide is __________ kg/Nm 3 .

N 2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)

A sample of well water contains 140 gm/m 3 Ca 2+ ions and 345 gm/m 3 Na + ions. The hardness of the sample of water, expressed in terms of equivalent CaCO 3 in gm/m 3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)

Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).

Vapor pressure of water at 100°C is about __________ bar.

At room temperature, the product [H + ] [OH - ] in a solution is 10 -14 moles/litre. If, [OH - ] = 10 -6 moles/litre, then the pH of the solution will be

6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H 2 produced will be __________ gm.

1 kgf/cm 2 is not equal to

The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol X M satisfies

One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH 4 + 2O 2 ? CO 2 + 2H 2 O. Both the reactants and products are in gas phase. ?H° 298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about