Atoms and Molec...

A sample of $$CaCO_3$$ has Ca - 40%, C = 12% and O = 48%. If the law of constant proportions is true, then the mass of Ca in 5 g of $$CaCO_3$$ from another source will be:

The number of electrons in one molecule of $$CO_{2}$$ are:

If one mole contains $$1.0 \times 10^{24}$$ particles, the mass of one mole of oxygen is:

The law of constant proportions was enunciated by: 

Zinc sulphate contains 22.65% Zn and 43.9% $$H_2O$$. If the law of constant proportions is true, then the mass of zinc required to give 40 g crystals will be:

Law of constant composition is same as the law of:

Atomic size is of the order of____________.

Hydrogen combines with chlorine to form HCI. It also combines with sodium to form NaH. If sodium and chlorine also combine with each other, they will do so in the ratio of their masses as:

The haemoglobin from red corpuscles of most mammals contains approximately 0.33% of iron by weight. The molecular weight of haemoglobin is 67,200. The number of iron atoms in each molecule of haemoglobin is:

$$X\ gm$$ $$A$$ atoms on combining with $$Y$$ atoms of $$B$$ form 5 molecules of a compound containing $$A$$ & $$B$$. Find the molecular weight of compound formed. (Atomic weight of $$B = M$$)