Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
MHT CET 202624 AprilMorning Shift
Exam
MHT CET
Year
2026
Date
24 April
Shift
Morning Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

MHT CET 2026 · 24 April · Morning Shift · Chemistry · Some Basic Concepts of Chemistry

Find the mass of lime obtained by heating 500 g of 90\% pure lime...

Find the mass of lime obtained by heating 500 g of 90%90\% pure lime stone. [Molar masses Ca=40\text{Ca}=40 g/mol, O=16\text{O}=16 g/mol   and C=12\ \text{ and } \text{C}=12 g/mol]

Options

  1. A252252 g
  2. B280280 g
  3. C265265 g
  4. D230230 g

Correct answer

A. 252252 g

Step-by-step solution

Mass of pure CaCO3\text{CaCO}_3 in the sample is 500×90100=450500 \times \dfrac{90}{100} = 450 g.

Molar mass of CaCO3=40+12+3×16=100\text{CaCO}_3 = 40 + 12 + 3 \times 16 = 100 g/mol.

Moles of CaCO3=450100=4.5\text{CaCO}_3 = \dfrac{450}{100} = 4.5 mol.

The decomposition reaction is:

CaCO3→CaO+CO2\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2

From the stoichiometry, 11 mole of CaCO3\text{CaCO}_3 produces 11 mole of CaO\text{CaO} (lime).

Moles of CaO\text{CaO} produced =4.5= 4.5 mol.

Molar mass of CaO=40+16=56\text{CaO} = 40 + 16 = 56 g/mol.

Mass of lime obtained =4.5×56=252= 4.5 \times 56 = 252 g.

Answer: 252252 g
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 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 2026Calculate the number of atoms in 52 moles of argon. MHT CET Medical 2026 Full Some Basic Concepts of Chemistry list All MHT CET Medical PYQs