Mole Concept and Molar Masses

The molecular formula of a molecule is obtained by taking the sum of the atomic masses of different atoms present in a molecule.

Define the structural formula.

Define an empirical formula.

The volume occupied by one molecule of water$(\mathrm{density}=1 \mathrm{g} {\mathrm{cm}}^{-3})$ is $3\times {10}^{-23} {\mathrm{cm}}^3$.

The pair of species having same percentage of carbon is -

The volume occupied by one molecule of water $(\mathrm{density}=1 \mathrm{g} {\mathrm{cm}}^{-3})$ is:

The volume occupied by one molecule of water$(\mathrm{density}=1 \mathrm{g} {\mathrm{cm}}^{-3})$ is $3\times {10}^{-23} {\mathrm{cm}}^3$.

The volume of a molecule multiplied by the total number gives ,what is called, _____.

The volume occupied by one molecule of water$(\mathrm{density}=1 \mathrm{g} {\mathrm{cm}}^{-3})$

The simplest formula of the compound containing nitrogen ($14 \mathrm{g}$) for each$40 \mathrm{g}$ of oxygen is 

Classify the following substances as elements, compounds and mixtures. In case of mixtures clearly indicate weather the mixture is homogeneous.

(iii) Distilled water

Number of molecules present in the $34$ grams of ammonia is _____ .

A silicon chip used in an integrated circuit of computer has a mass of $5.68 mg$ . The number of $Si$ atoms present in this chip are

To prepare a $0.2\mathrm{M}{\mathrm{C}}_{12}{\mathrm{H}}_{22}{\mathrm{O}}_{11}$ solution, How much sucrose should be required in one litre solution?

An organic compound contains $\text{C}=40\text{\%},\text{H}=13.33\text{\%}$ and $\text{N}=46.67\text{\%}$ . Its empirical formula is

Two oxides of a metal contain 27.6% and 30% of oxygen respectively. If the formula of the first oxide is MO, the formula for the second oxide is

7.5 g of KCl and 11.7 g of NaCl are mixed in 2000 ml of water. Assuming no change in volume the total mass of chloride ions in the solution is

Calculate the number of $\mathrm{C}{\mathrm{l}}^{-1}\mathrm{ }\mathrm{a}\mathrm{n}\mathrm{d}\mathrm{ }\mathrm{C}{\mathrm{a}}^{+2}\mathrm{ }\mathrm{i}\mathrm{o}\mathrm{n}\mathrm{s}\mathrm{ }\mathrm{i}\mathrm{n}\mathrm{ }333\mathrm{ }\mathrm{g}$ anhydrous $\mathrm{C}\mathrm{a}\mathrm{C}{\mathrm{l}}_2$ .

If it requires one second to count four wheat grains, calculate the time in years to count one mole of wheat grains.

What is the weight of $3.01\mathrm{ }\times {10}^{23}$ molecules of ammonia?