Atoms and Molec...

$$\displaystyle n_{1}$$ g of substance X reacts with $$\displaystyle n_{2}$$ g of substance Y to form $$\displaystyle m_{1}$$ g of substance R and $$\displaystyle m_{2}$$ g of substance of S. This reaction can be represented as $$X + Y \rightarrow R + S$$. The relation which can be established in the amounts of the reactants and the products will be :

The most accurate statement with regard to the significance of Avogadro's number, $$6.02 \times {10}^{23}$$.

Molecules are made up of ..........

A charged particle formed by the loss or gain of electrons during a compound formation is called an ..... 

$$1.375$$ g of cupric oxide was reduced by heating in a current of hydrogen and the weight of copper obtained was $$1.098$$ g. In another experiment, $$1.156$$ g of copper was dissolved in nitric acid and the resulting solution was evaporated to dryness. The residue of copper nitrate when strongly heated was converted into $$1.4476$$ g of cupric oxide. State the law illustrated by these chemical combinations.

What is the ratio of the number of atoms of elements potassium, chlorine, and oxygen respectively present in $$245 g$$ of $$KCl{ { O }_{ 3 } }$$?

On heating $$KClO_{3}$$ at a certain temperature, it is observed that one mole of $$KClO_{3}$$ yields one mole of $$O_{2}$$. What is the mole fraction of $$KClO_{4}$$ in the final solid mixture containing only $$KCl$$ and $$KClO_{4}$$, the latter being formed by the parallel reaction?

Which of the following contains the greatest number of atoms ?

The atomic weight of silicon is $$28.086$$ and that of oxygen is $$15.9994$$ (on the $$C^{12}$$ scale). Calculate the mass in grams of a single molecule of $$SiO_2$$.

The correct increasing order of molecular masses is: