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Question

What is the value of Avogadro's constant?

This question was previously asked in
RRB JE 2018 CBT 1 Question Paper (01-Jun-2019) Shift 3
The correct answer is

6.022 × 1023

6.022 × 1023 is correct.

Avogadro's constant is the number of particles (atoms, molecules or ions) in one mole of a substance.

Its value is 6.022 × 1023 mol−1, the number of atoms in exactly 12 g of carbon-12.

The other values change either the digits (6.222, 6.322) or the power of ten (1033).

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Important Questions from Mole Concept

  1. Which of the following correctly represents the number of atoms in one mole of CH3 OH?

  2. A solution of Gallic acid in ethanol was made by dissolving 0.05 mg in 250 mL of ethanol(w/v). This solution in ppm would be ______________.

  3. The molarity of a solution containing 5 gram of Sodium hydroxide (NaOH) in 500 millilitre solution is : (Take atomic weights of elements as : Na = 23, O = 16, H = 1)

  4. \(1\cdot7\text{ g}\) of silver nitrate is dissolved in \(100\text{ g}\) of water, and \(0\cdot585\text{ g}\) of sodium chloride is dissolved in \(100\text{ g}\) of water. Both are mixed and a chemical reaction occurs. \(1\cdot435\text{ g}\) of silver chloride and \(0\cdot85\text{ g}\) of sodium nitrate are formed. Which law of chemical combination is shown by the above reaction?
  5. The volume of 10 g of gas X is 5.6 litre at NTP. What is the molecular weight of X?
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