Some Basic Conc...

"One gram moecule of gas at N.T.P occupies $$22.4$$ litres." This fact was derived from?

A $$0.60g$$ sample consisting of only $$Ca{C}_{2}{O}_{4}$$ and $$Mg{C}_{2}{O}_{4}$$ is heated at $${500}^{o}C$$, converting the two salts of $$Ca{CO}_{3}$$ and $$Mg{CO}_{3}$$. The sample then weighs $$0.465g$$. If the sample had been heated to $${900}^{o}C$$, where the products are $$CaO$$ and $$MgO$$, what would the mixtures of oxides have weighed?

If mass percentage of iron in a biomolecule is 0.4% then the minimum molecular weight of biomolecule will be (Atomic weight of Fe = 56)

Zinc sulphate contains 22.65% Zn and 43.9% $$ \mathrm { H } _ { 2 } \mathrm { O } $$ . if the law of constant proportions is true, then the mass of Zinc required to give 40g crystal will be

60 g of solution containing 40% by mass of $$NaCl$$ are mixed with 100 g of a solution containing 15% by mass $$NaCl$$. Determine the mass percent of sodium chloride in the final solution.

The weight of $$C{H_4}$$ in 9-L cylinder at $${27^0}C$$ temperature  and $$16$$ atm pressure is ($$R=0.08$$ L atm $${K^{ - 1}}\,mo{l^{ - 1}}$$).

Which of the following represents the Avogadro number?

What is the value of $$n$$ in the following equation?

Mass of the one atom of the element X is $$1.66 \times 10^{-26}$$ g. Number of atoms in 1 g of the element is:

A sample of potato starch was ground in ball mill to give a starch lime molecule of lower molecular weight. The product analysed $$0.86\%$$ phosphorus.  If each molecule is assumed to contain one atom of phosphorus.The molecular weight of the material is:-