Chemistry teacher

 -Dr.Sanjaykumar Pawar  CBSE Class 11 Chemistry – Chapter 1  Complete NCERT Class 11 Chemistry Chapter 1 exercise solutions , covering significant figures, limiting reagents, stoichiometry, mole concept and chemical calculations. Some Basic Concepts of Chemistry NCERT Exercise Questions and Solutions (1.1–1.19) Answer Writing Format: All solutions are presented in a systematic CBSE Board examination format, including formulas, substitutions, calculations and final answers with appropriate units. Question 1.1 – Calculate the Molar Mass Calculate the molar mass of the following: (i) H 2 O (ii) CO 2 (iii) CH 4 Solution: (i) Water (H 2 O) Atomic masses: H = 1.008 g mol -1 O = 16.00 g mol -1 Molar mass of H₂O = 2(1.008) + 16.00 = 18.016 g mol⁻¹ (ii) Carbon dioxide (CO 2 ) Molar mass of CO₂ = 12.01 + 2(16.00) = 44.01 g mol⁻¹ (iii) Methane (CH 4 ) Molar mass of CH₄ = 12.01 + 4(1.008) = 16.042 g mol⁻¹ Final Answers: (i) H₂O = 18.016 g...

 - Dr Sanjay Kumar Pawar  NEET Mole Concept: Formulas, Tricks & PYQs Balanced equations reveal mole ratios — the heart of every stoichiometry problem. The Mole Triangle: connecting mass, particles, and gas volume in one simple diagram. From grams to moles to molecules: the core conversion every NEET aspirant must master. Internal Links States of Matter and Gas Laws — natural follow-up since gas volume/STP concepts are shared. Chemical Equilibrium — reuses mole ratio and concentration term concepts. Redox Reactions and Electrochemistry — builds directly on equivalent weight and n-factor concepts introduced here. Solutions and Colligative Properties — molarity, molality, and mole fraction are foundational to this chapter. Atomic Structure — links back to Avogadro's number and atomic mass fundamentals. Some Basic Concepts of Chemistry (NCERT Class 11, Ch. 1) — the parent chapter; link as the primary pillar page. NEET Chemistry Formula Sheet (all chapters) NEET Previous Year Q...