Mole Concepts Questions

80 g of oxygen gas contains as many atoms as in;

Common salt obtained from sea-water contains 95% NaCl by mass. The approximate number of molecules present in 10 g salt is;

The percentage of nitrogen in urea (NH2CONH2), is;

The simplest formula of the compound containing 50% X (atomic mass 10 amu) and 50% Y (atomic mass 20 amu) is;

Which of the following alkanes has 75% of carbon?

Which of the following phrases would be incorrect to use?

How much volume of oxygen will be required for complete combustion of 40 mL of acetylene (C2H2)? (All volume are measured at STP) 2C2H2 + 5O2 → 4CO2 + 2H2O

The molecular formula of a compound is C6H12O6. What’s the empirical formula?

Which of the following is an example of a compound?

The moles of O2 required for reacting with 6.8 g of ammonia is:4NH3 + 5O2 → 4NO + 6H2O

The mass of 1 × 1023 molecules of H2O is:

When 60 g of salt is dissolved in 600 mL of water, the mass by volume percentage of salt in the solution is:

8 g NaOH is dissolved in one litre of solution, its molarity is:

Mass of one molecule of methane (CH4) is:

The statement which correctly represents Avogadro’s hypothesis is:

Given below are two statements: Assertion (A): The reactant which gets consumed first, limits the amount of product formed. Reason (R): The reactant which decides the amount of product formed is called excess reagent.In the light of the above stateme

The number of ions present in 2 L of a solution of 1.6 M Al2(SO4)3 is:

What are the multiples for pico and deci respectively?

Given below are two statements: Statement I: 10 ppm means 10 g solute in 106 g solution. Statement II: 1 m NaOH means 1 mol of NaOH is present in 1000 g solution.

Which of the following law states that, “a given compound always contains exactly the same proportion of elements by weight”?

The correct scientific notation for 0.0000212 is:

Percentage of water in hydrated sodium carbonate (Na2CO3·10H2O) is:

One mole of CO2 contains:

Given below are two statements:Statement I: Mass of 1 mole of oxygen gas is more than 1 mole nitrogen gas. Statement II: 2 mole nitrogen gas occupies more volume than oxygen at STP.In the light of the above statements, choose the correct answer from

Formula mass is used instead of molecular mass for:

One atomic mass unit is defined as a mass exactly equal to:

The mass of one ammonia (NH3) molecule is:

The mass percentage of carbon in ethanol (C2H5OH) is:

Which of the following concentration term is temperature dependent?

The maximum number of atoms are present in:

Empirical formula of a hydrocarbon containing 85.71% carbon is:

Given below are two statements: Statement I: The sum of mole fractions of all the components in a solution is always unity. Statement II: One gram molecule of hydrogen contains NA atoms of hydrogen.In the light of the above statements, choose the mos

The amount of H2O formed by the reaction of 10 g of H2 with 64 g of O2 is:

The value of 40°C in Fahrenheit scale will be:

One mole of which species has maximum number of electrons?

An element Z contains two naturally occurring isotopes 17Z35 and 17Z37. If the average atomic mass is 35.5 u, then the percentage of two isotopes 17Z35 and 17Z37 repectively is:

Given below are two statements: Assertion (A): 2 moles of N2 on reaction with 9 moles of H2 will produce 4 moles of NH3. Reason (R): H2 is a limiting reagent.In the light of above statements, choose the correct answer from the options given below:

For which of the following reactions Gay-Lussac’s law is not valid?

Number of moles present in 3.6 g of a gas having vapour density 18 is:

2.4 g of Mg is burnt with 3.2 g of O2 in a closed vessel. The amount of MgO formed is:[Atomic mass of Mg = 24 u, O = 16 u]Mg + O2→ MgO

6.022 × 1021 molecules of glucose are present in 100 mL of solution. The concentration of solution is:

Find the number of atoms present in 1.6 g of methane:

20 g of metal combines with oxygen to form 60 g of metal oxide (MO). The percentage of oxygen in metal oxide is:

1 amu is equal to:

A quantity of 2.0 g of a triatomic gaseous element was found to occupy a volume of 448 ml at 76 cm of Hg and 273 K. The mass of its each atom is:

x g of propane (C3H8) on combustion with 32 g of oxygen produces 26.4 g of CO2 and 14.4 g of H2O. The value of x is:

If isotopic distribution of ¹²C and ¹⁴C is 98.0% and 2.0%, respectively, then the number of ¹⁴C atoms in 12 g of carbon is:

Match List I with List IIChoose the correct answer from the options given below

The moles of O2 required for reacting with 6.8 g of ammonia is: 4NH3 + 5O2 → 4NO +6H2O

The number of ions present in 2 L of a solution of 1.6 M Al2(SO4)3 is; [Given: NA = 6 × 1023 ]