Molecular Mass

Calculate the molar mass of ${\mathrm{KMnO}}_4$.

Which have maximum number of Chlorine atoms?

•  $1$ gram chlorine $\mathrm{Cl}$
•  $1$ gram of ${\mathrm{Cl}}_2$

Calcium chloride is when dissolved in water dissociates into its ions according to the following equation:

${\mathrm{CaCl}}_2\left(\mathrm{aq}\right)\to {\mathrm{Ca}}^{2+}\left(\mathrm{aq}\right)+2{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right)$

Find the number of ions present in $11.1 \mathrm{g}$ of Calcium chloride. [ Given: $\mathrm{Ca}=40 \mathrm{u}$, $\mathrm{Cl}=35.5 \mathrm{u}$]

1 mole of ${\mathrm{H}}_2\mathrm{O}$ vapour occupies how much volume at STP.

Fill in the missing data in the following table:

Find the number of mole and number of molecules present in $2084$ g of Sodium sulphate.

The number of electrons required to reduce $4.5\times {10}^{-5}\mathrm{g}$ of Aluminium is _____.

The following questions are about one mole of sulphuric acid $\left({\mathrm{H}}_2{\mathrm{SO}}_4\right)$:

(i) Find the number of gram atoms of Hydrogen in it.

(ii) How many atoms of Hydrogen does it have?

(iii) How many atoms (in grams) of Hydrogen are present for every gram atom of oxygen in it?

$4.8 \mathrm{g}$ of magnesium is burnt with $6.4 \mathrm{g}$ oxygen gas in a closed vessel. What is the maximum mass of $\mathrm{MgO}$ formed in the reaction?

Choose the wrong statement:

Calculate the number of molecules and number of atoms present in $1.2 \mathrm{g}$ of ozone.

Find the molar mass of $\mathrm{CO}({\mathrm{NO}}_3{)}_2.6{\mathrm{H}}_2\mathrm{O}$.

How many atoms of magnesium are there in $3 \mathrm{g}$ of magnesium?

The percentage by volume of ${\mathrm{C}}_3{\mathrm{H}}_8$ in a gaseous mixture of ${\mathrm{C}}_3{\mathrm{H}}_8, {\mathrm{CH}}_4 \text{and} \mathrm{CO} \text{is} 20.$ When $100 \mathrm{mL}$ of the mixture is burnt in excess of ${\mathrm{O}}_2$, the volume of ${\mathrm{CO}}_2$ produced is:

The average mass of an atom of uranium is $3.9\times {10}^{-25} \mathrm{kg}$. Find the number of atoms in $1 \mathrm{g}$ of uranium.

What is Avagadro constant?

Who invented mole??

The formula unit mass of sodium chloride is:

Given the atomic masses of soidum and chlorine as 23 u and 35.5 u respectively. Calculate the formula unit mass of sodium chloride.

The formula unit mass of sodium chloride is _____ (58.5 u/32.5 u).