Mole Concepts Questions

What will be the vapour density of P2O5 ?[Atomic mass of P = 31 amu and O = 16 amu]

The volume occupied by 20 g of hydrogen gas at STP, is ____L [Molar volume of gas at STP is 22.4 L]

How many grams of silicon are present in 35- gram atoms of silicon (Given at. wt. of Si = 28)?

Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure lime stone (CaCO3).

How many moles of potassium chlorate to be heated to produce 11.2 litre oxygen

The molarity of 20% (W/W) solution of sulphuric acid is 2.55 M. The density of the solution is

Naturally occurring chlorine is 75 % Cl35 and 25 % Cl37. Calculate the average atomic mass of chlorine

8 litre of H2 and 6 litre of Cl2 are allowed to react to maximum possible extent. Find out the final volume of reaction mixture. Suppose P and T remains constant throughout the course of reaction

112.0 mL of NO2 at STP was liquefied, the density of the liquid being 1.15 g mL−1. Calculate the number of molecules in the liquid NO2 (At. wt. N = 14)

The ratio of total number of electrons present in 48 g of O₃ to 24 g of O₂ is

25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ions, CO32– are respectively (Molar mass of Na2CO3 = 106 g mo

The number of atoms in 20 g of SO3 is approximately -

For a reaction, N₂(g) + 3H₂(g) → 2NH₃(g) Identify dihydrogen (H₂) as a limiting reagent in the following reaction mixtures:

Compounds A, B and C have same empirical formula CH3. If molecular formula of compound – A, B and C is x, y and z respectively then select correct statements. A. x may be (CH3)2 B. z may be (CH3)1.5 C. y may be (CH3)5

Given below are two statements: Statement-I: Atoms are neither created nor destroyed in a chemical reaction. Statement-II: Compounds are formed when atoms of different elements combine in a fixed ratio.

Match List-I with List-II A. 3 mole of Fe3S2 B. 1 mole of FeSO4 C. 2 mole of O3 D. 1.5 mole of K2CO3

Given below are two statements:Statement-I: 1g O2 and 1g O3 have equal number of atoms.Statement-II: Mass of 1 mole of an atom is equal to its gram-atomic mass.

A solution contains 4 mol of ethanol and 6 mol of water. The mole fraction of ethanol in the solution is;

How many molecules does 1 mole of carbon dioxide contain?

The volumes of hydrogen & oxygen when combined to form H2O bear a simple ratio of 2:1. This is explained by;

A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of two gases in the mixture?

Number of atoms present in 16 amu of He is;

How many moles of electron weigh one kilogram?

One gram molecule of benzene is equal to;

Scientific notation for the number 0.0001345 is

Formation of CO and CO2 illustrates the law of ;

A measured temperature on Fahrenheit scale is 200°F. What will this reading be on the Celsius scale?

The prefix for multiple 10⁻¹² is;

With increase of temperature, which of these changes?

Avogadro’s number is the number of molecules present in

The maximum amount of BaSO4 that can be obtained on mixing 0.5 mol BaCl2 with 1 mol H2SO4 is

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion (A): One amu is equal to 1.66 × 10⁻²⁷ kg. Reason (R): One amu is the actual mass of one atom of C–12.

A molal solution is the one that contains one mole of a solute in:

What is the mass of oxygen required for the complete combustion of 2.8 kg of ethylene? C2H4 + 3O2 → 2CO2 + 2H2O

The number of significant figures for the three measurements 161 cm, 0.161 cm, 0.0161 cm are respectively

An element, X has the following isotopic composition: 200X:90%, 199X:8.0%, 202X:2.0% The weighted average atomic mass of the naturally occurring element X is closest to

Given below are two statements: Statement-I: Average atomic mass of chlorine is fractional. Statement-II: Average atomic mass is calculated by using natural abundances of different isotopes.

The number of water molecules is maximum in

The number of atoms in 0.1 mole of a triatomic gas is;

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion (A): Molality and mole fraction concentration units do not change with temperature. Reason (R): The concentration terms, molality and mole

Given below are two statements: Statement-I: 1 mole H2SO4 contains same mass of oxygen and sulphur. Statement-II: 1 mole H2SO4 represents 98 g mass.

5.85 g NaCl is dissolved in 1 L water. The total number of Na+ and Cl– ions in 1 mL of this solution will be;

The law of multiple proportions is illustrated by the pair of compounds;

Given below are two statements: Statement-I: Avogadro’s number is a dimensionless quantity. Statement-II: Avogadro’s number is equal to the number of atoms or molecules in one gram mole.

Consider the following statements. A. 1 mole electrons are equal to 6.022 × 10^23 electrons. B. The mass of NA electrons is equal to 5.48 × 10^−7 kg C. Number of particle present in 1 mole of nitrogen atom are 6.023

How many significant figures are in 0.0005?

The number of molecules in 1 mL of CO2 at STP is;

Equal masses of H2, O2 and CH4 have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H2 : O2 : CH4 would be;

Given below are two statements: Statement-I: Vapour density of CH4 is half of O2. Statement-II: 1.6 g of CH4 contains same number of electrons as 3.2 g of O2.In the light of the above statements, choose the most appropriate answer from the options gi

Match List I with List II A.