Mole Concept

A certain amount of calcium nitrate is subjected to heating. The oxygen obtained get completely exhausted on reaction with $4.8 \mathrm{g}$ of magnesium. Calculate the amount of calcium nitrate taken and also the amount of final product obtained.

Two moles of chlorine atoms are present in how many grams of chlorine gas?

The percentage of a trivalent metal in a metallic oxide is $53\%$. How many grams of this metallic oxide should be required to produce $22.8 \mathrm{g}$ of salt when treated with excess sulphuric acid?

$44.8 \mathrm{L}$ of ammonia at STP on decomposition gives X g of Nitrogen. How many molecules of Oxygen are required to produce ${\mathrm{NO}}_2$ from X g of Nitrogen?

Calculate the number of molecules of gaseous product obtained on heating $8.8 \mathrm{g}$ of ${\mathrm{CO}}_2$ with coke if the conversion of ${\mathrm{CO}}_2$ is $80\%$ by mass.

The molecular weight of gas A is $10$ times greater than the molecular weight of gas B. These two gases are taken in cylinders of $5 \mathrm{L}$ volume at $1 \mathrm{atm}$ pressure and $27°\mathrm{C}$. Comment on the number of molecules in the two gases. Justify with respect to kinetic molecular theory of gases.

A patient Vasu had to survive for a month on artificial respiration before he passed away. A nurse was instructed to give him $7.5 \mathrm{g}$ of glucose per hour for consumption to meet the energy requirement. What volume of carbogen $( 95\% {\mathrm{O}}_2 + 5\% {\mathrm{CO}}_2)$had to be supplied for Vasu assuming that he was kept under the conditions of$27°\mathrm{C}$ and normal atmospheric pressure?

$710 \mathrm{g}$ of chlorine gas contains X atoms of chlorine. Calculate the mass of sodium chloride which contains X number of chloride radicals. (atomic weight of Na is $23 \mathrm{g}$)

How many moles of water are required to be dissociated to produce oxygen which is just sufficient to form $800 \mathrm{g}$ of magnesium oxide by burning magnesium? (atomic weight of Mg is $24$)

How many grams of oxygen contain the same number of molecules as present in $352 \mathrm{g}$ of ${\mathrm{CO}}_2$?

The ratio of nitrogen and oxygen by mass percent in a colorless gas is $7 : 8$. When this colourless gas combines with ${\mathrm{O}}_2$, it produces $44800 {\mathrm{cm}}^3$ of a brown-coloured gas at STP. Find out the number of moles of oxygen that have taken part in the reaction.

How many molecules of hydrogen chloride can be synthesised from $896 \mathrm{L}$ of chlorine gas at STP?

$47 \mathrm{g}$ of impure ${\mathrm{Al}}_2{\mathrm{O}}_3$ is reduced electrolytically to give aluminium and oxygen. Calculate the amount of aluminium produced. 

Give the value for the following:

Gram atom of potassium $=$ _____  $\mathrm{g}$ of potassium.

Give the value for the following:

Gram atom of chlorine $=$ _____  $\mathrm{g}$ of chlorine.

What is the volume of oxygen liberated at STP when $24.5 \mathrm{g}$ of potassium chlorate is subjected to heating?

$160 \mathrm{mL}$ of carbon monoxide is mixed with $100 \mathrm{mL}$ of oxygen and the mixture is ignited. What volume of oxygen is left behind? (Assume that all volumes are measured under same conditions.)

The number of molecules present in $2.8 \mathrm{g}$ of nitrogen is:

Which of the following reactions is associated with same volume ratio as the reaction of formation of ${\mathrm{CO}}_2$ from $\mathrm{CO}$ and ${\mathrm{O}}_2$?

The ratio of number of molecules present in a given mass of oxygen and sulphur trioxide is