Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2004
Exam
NEET
Year
2004
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

NEET 2004 · Chemistry · Some Basic Concepts of Chemistry

The maximum number of molecules is present in:

The maximum number of molecules is present in:

Options

  1. A15 L15 \mathrm{~L} of H2\mathrm{H}_2 gas at STP
  2. B5 L5 \mathrm{~L} of N2\mathrm{N}_2 gas at STP
  3. C0.5 g0.5 \mathrm{~g} of H2\mathrm{H}_2 gas
  4. D10 g10 \mathrm{~g} of O2\mathrm{O}_2 gas

Correct answer

A. 15 L15 \mathrm{~L} of H2\mathrm{H}_2 gas at STP

Step-by-step solution

At STP 22.4 LH2=6.023×102322.4 \mathrm{~L} \mathrm{H}_2=6.023 \times 10^{23} molecules 15 LH2=6.023×1023×1522.4=4.033×10235 L N2=6.023×1023×522.4=1.344×10230.5 gH2=6.023×1023×0.52=1.505×102310 gof2=6.023×1023×1032=1.882×1023.\begin{aligned}15 \mathrm{~L} \mathrm{H}_{2} & =\frac{6.023 \times 10^{23} \times 15}{22.4}\\ & =4.033 \times10^{23} \\ 5 \mathrm{~L} \mathrm{~N}_{2} & =\frac{6.023 \times 10^{23} \times 5}{22.4}\\ & =1.344 \times10^{23} \\ 0.5 \mathrm{~g} \mathrm{H}_{2} & =\frac{6.023 \times 10^{23} \times 0.5}{2}\\ & =1.505 \times10^{23} \\ 10 \mathrm{~g} \mathrm{of}_{2} & =\frac{6.023 \times 10^{23} \times 10}{32}\\ & =1.882 \times10^{23} . \end{aligned}
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 NEET PYQs