Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
MHT CET202619 April 2026Evening ShiftChemistrySome Basic Concepts of ChemistryActual

Chlorine has two isotopes Cl ³⁷ and Cl ³⁵ with percentage abundance of 25 % and 75 % respectively. Find average atomic mass of chlorine ?

Options

  1. A35
  2. B37
  3. C35.5
  4. D36

Correct answer

C. 35.5

Step-by-step solution

Average atomic mass is calculated using the formula: Average atomic mass = ( Isotopic mass Percentage abundance ) 100 Substituting the given values: Average atomic mass = 37 25 + 35 75 100 Average atomic mass = 925 + 2625 100 Average atomic mass = 3550 100 = 35.5 Answer: 35.5

Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

How many molecules of C O₂ (g) are obtained on reaction of 24 grams of methane with 4moles of oxygen? 2026500 mL of an aqueous solution of glucose C₆ H₁₂ O₆ (Molar mass 180 gmol ⁻¹ ) contains 6.02 10²² molecules. The concentration of the solution will be: 2026The mass of precipitate formed when 50 mL of 16.9% aqueous solution of AgNO ₃ is mixed with 50 mL of 5.8% NaCl solution is------------g [Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 3 2026100 mL of 1.0 M aqueous NaOH solution was diluted to 1.0 L by adding water. Half of this solution was discarded. A new 100 mL of 0.5 M aqueous NaOH solution was added to the remain 2026From the given information, select the suitable law of chemical combination: Cupric Carbonate % of Cu % of C % of O Natural Sample 51.35 9.74 38.91 Synthetic Sample 51.35 9.74 38.9 2026Match List-I with List-II and select the correct option (Based on mole concept): List-I List-II (a) 2 moles of ethene (i) 11.2 L volume at STP (b) Mass is equal to 66 g (ii) 56 g ( 2026The mass of a mixture containing NaCl and NaBr is 4.0 g. If Na is 30 % of the total mixture, the composition of NaCl in the mixture is 2025Two acids A and B are titrated separately. 25 mL of 0.5 M Na ₂ CO ₃ solution requires 10 mL of A and 40 mL of B for complete neutralisation. The volume (in L) of A and B required t 2025 Full Some Basic Concepts of Chemistry list All MHT CET PYQs