Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AIIMS 2014
Exam
AIIMS
Year
2014
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

AIIMS 2014 · Chemistry · Some Basic Concepts of Chemistry

The number of atoms in 52 ~g of He is

The number of atoms in 52 g52 \mathrm{~g} of He\mathrm{He} is

Options

  1. A78.299×102478.299 \times 10^{24} atoms
  2. B7.820×10−247.820 \times 10^{-24} atoms
  3. C7.829×10247.829 \times 10^{24} atoms
  4. D78.234×102578.234 \times 10^{25} atoms

Correct answer

C. 7.829×10247.829 \times 10^{24} atoms

Step-by-step solution

Number of atoms =NA× mass  At. mass =6.023×1023×524=7.829×1024=\frac{N_A \times \text{ mass }}{\text{ At. mass }} =\frac{6.023 \times 10^{23} \times 52}{4}=7.829 \times 10^{24} atoms
Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

Calculate the mass of potassium chlorate required to liberate 6.72 dm^3 of oxygen at STP.… MHT CET Medical 2026Find the mass of lime obtained by heating 500 g of 90\% pure lime stone. [Molar masses… MHT CET Medical 2026A coordination complex contains 2.6\ \% of Mg. Find the number of Mg atoms in 5.0 g of… MHT CET Medical 2026Calculate the number of moles and molecules of chlorine in 4.48\ dm^3 of chlorine at STP. MHT CET Medical 2026What is the gram atomic mass of an element whose mass of one atom is 3.9853 × 10^ -23 \ g… MHT CET Medical 2026Calculate the total mass and number of molecules present in 3 moles of benzene. MHT CET Medical 2026Which of the following gases has high vapour density at same temperature and pressure? MHT CET Medical 2026What is the number of moles of Cl atoms present in n moles of tear gas and in n moles of… MHT CET Medical 2026 Full Some Basic Concepts of Chemistry list All AIIMS PYQs