Given below are the Mole Concepts Questions with Detailed Solutions

a. Concepts questions

b. Calculation problems

c. percentage composition

d. Mole fraction & molarity

a. Concepts questions

b. Calculation problems

c. percentage composition

d. Mole fraction & molarity

How many molecules of water are there in 54 g of $H_2O$ ?

Solution

Calculate the mass of $6.022 \times 10^{23}$ molecule of $NH_4Cl$ ?

Solution

Calculate the mass of $12.044 \times 10^{23}$ Oxygen atoms.

Solution

How many atoms of hydrogen are there in 36 g of $NH_4$?

Solution

Calculate the number of hydrogen atoms in 1 mole of H

Solution

Calculate the number of Cu atoms in 0.3175 g of Cu.

Solution

Calculate the number of molecules in 22.4 litres of CH

Solution

a. Find the volume of 1 g of H

b.Find the volume of 20g H

c.What is the volume occupied by $6.022 \times 10^{23}$ molecules of any gas at NTP?

Solution

An atom of some element Y weighs $6.644 \times 10^{-23}$ g. Calculate the number of gram-atoms in 40 kg of it.

Solution

Find the number of moles and number of atoms of H and S in 10 mole of $H_2S$.

Solution

Calculate the number of atoms of each element in 245 g of $KClO_3$.

Solution

If 4 g of NaOH dissolves in 36 g of $H_2O$, calculate the Mole fraction of each component in the solution. Also, determine the Molarity of solution (specific gravity of solution is 1 gm/L)

Solution

Calculate the number of atoms in 12.2 litres of the below gas at NTP

(i) mono-atomic

(ii) diatomic gas

Solution

If a mole were to contain $1 \times 10^{24}$ particles, what would be the mass of

(i) one mole of oxygen

(ii) a single oxygen molecule?

Solution

Calculate the standard molar volume of oxygen gas. The density of $O_2$ gas at NTP is 1.429 g/L.

Solution

if 2 mol of Calcium Carbonate (Formula Weight =100) occupies a volume of 67.0 ml, Find the density ?

Solution

Calculate how many methane molecules and how many carbon and hydrogen atoms are there in 25 g of Methane?

Solution

A metal M of atomic mass 54.94 has a density of 7.42g/cc. Calculate the apparent volume occupied by one atom of the metal.

Solution

Calculate the number of moles of Ca, C and oxygen atoms and its mass in 200 g of $CaCO_3$.

Solution

Calculate the total number of electrons present in 3.2 g of CH

Solution

How much Calcium is in the amount of Ca(NO

Solution

State the number of atoms in 1 g atom of Aluminium?

Solution

If the components of the air are N

Solution

How many molecules are there in 1.624 gm Ferric chloride(FeCl

Solution

What is the mass of 1 Ammonia Molecule ?

Solution

The atomic masses of two elements (P and Q) are 20 and 40 respectively. x g of P contains y atoms, how many atoms are present in 2x g of Q?

Solution

Oxygen is present in a 1-litre flask at a pressure of $7.6 \times 10^{-10}$ mm of Hg at 0°C. Calculate the number of oxygen molecules in the flask.

Solution

What is the ratio of the volumes occupied by 1 mole of O

Solution

Calculate the mass of .5 moles of CaCO

Solution

The cost of the Table Salt(NaCl) and Table sugar($C_{12}H_{22}O_{11}$) is Rs 10 and Rs 40 per kg. Find the cost of the salt and sugar per mole?

Solution

Calculate the number of oxygen atoms in 0.2 mole of Na

Solution

A polystyrene, having the formula $Br_3C_6H_3(C_3H_8)_n$, was prepared by heating styrene with tribromobenzoyl peroxide in the absence of air. If it was found to contain 10.46% bromine by weight, find the value of n.

Solution

It has been estimated that 93% of all atoms in the entire universe are hydrogen and that the vast majority of those remaining are helium. Based on only these two elements, estimate the mass percentage composition of the universe.

Solution

The molecular weight of haemoglobin is about 65,000 g/mol. Haemoglobin contains 0.35% Fe by mass. How many iron atoms are there in a haemoglobin molecule?

Solution

Calculate the Number of atoms of oxygen present in 88g of $CO_2$. What would be the weight of the Carbon monoxide having the same number of oxygen atoms?

Solution

At room temperature, the density of water is 1.0 g/mL and the density of ethanol is 0.789 g/mL. What volume of ethanol contains the same number of molecules as are present in 175 mL of water?

Solution

Chlorophyll the green colouring matter of plants responsible for photosynthesis contains 2.68% of Magnesium by weight.Calculate the number of magnesium atoms in 4 g of Chlorophyll

Solution

Calculate approximately the diameter of an atom of mercury, assuming that each atom is occupying a cube of edge length equal to the diameter of the mercury atom. The density of mercury is 13.6 g/cc.

Solution

How many years it would take to spend Avogadro number of rupees at the rate of Rs 10 laks per sec?

Solution

Find the total number of neutrons present in 7 mg of

Solution

**Notes**- Some Basic Concepts of Chemistry
- Physical States of matter
- Chemical Classification Of matter
- The International System of Units (SI units)
- Significant Figures
- Laws of Chemical Combination
- Atomic Mass
- Molecular Mass
- Mole Concept (Avogadro Constant) And Molar mass
- Gram Atomic Mass
- Gram Molecular Mass
- Percentage composition
- StioChiometry
- Mole Fraction
- Molarity Definition
- Molality Definition
- Normality Formula

**Questions**