Class 9 Chemistry | New Book Chapter 2 Lecture 14 | Calculating Relative Atomic Mass of Lead (Pb) 🧮 скачать в хорошем качестве

Class 9 Chemistry | New Book Chapter 2 Lecture 14 | Calculating Relative Atomic Mass of Lead (Pb) 🧮

Complete Lecture Series: Class 9 Chemistry | Complete New Book (Chapters 1-13) | Punjab Board 🔥📘    • Class 9 Chemistry | Complete New Book (Cha...   🚀 Welcome to Chapter 2 of Class 9 Chemistry – Calculating the Relative Atomic Mass of Lead (Pb)! In this lecture, we will calculate the Relative Atomic Mass (Ar) of lead (Pb) using its isotopic abundances and atomic masses. This exercise is essential for understanding how the average atomic mass of an element is determined based on the presence of its isotopes, aligning with the Punjab Board curriculum. 📘 Numerical Statement: Calculate the relative atomic mass of Lead (Pb). The isotopic abundances and atomic masses of its isotopes are as follows: Lead-204 (^204Pb): Abundance: 2.0% Atomic Mass: 203.973 u Lead-206 (^206Pb): Abundance: 24.0% Atomic Mass: 205.974 u Lead-207 (^207Pb): Abundance: 22.0% Atomic Mass: 206.976 u Lead-208 (^208Pb): Abundance: 52.0% Atomic Mass: 207.977 u 📊 Calculation Steps: Convert percentages to decimals: 2.0% = 0.020 24.0% = 0.240 22.0% = 0.220 52.0% = 0.520 Multiply each isotope's atomic mass by its relative abundance: (^204Pb): 203.973 u × 0.020 = 4.0795 u (^206Pb): 205.974 u × 0.240 = 49.4338 u (^207Pb): 206.976 u × 0.220 = 45.5347 u (^208Pb): 207.977 u × 0.520 = 108.1480 u Add the results to obtain the relative atomic mass: 4.0795 u + 49.4338 u + 45.5347 u + 108.1480 u = 207.1960 u Therefore, the relative atomic mass of lead (Pb) is approximately 207.20 u. This lecture is specially designed for Class 9 students under the Punjab Board system, encompassing: Board of Intermediate and Secondary Education, Lahore Board of Intermediate and Secondary Education, Faisalabad Board of Intermediate and Secondary Education, Multan Board of Intermediate and Secondary Education, Rawalpindi Board of Intermediate and Secondary Education, Gujranwala Board of Intermediate and Secondary Education, Bahawalpur Board of Intermediate and Secondary Education, Sargodha Board of Intermediate and Secondary Education, Sahiwal Board of Intermediate and Secondary Education, Dera Ghazi Khan ✅ Watch till the end for comprehensive explanations and insights that will aid in your exam preparation and deepen your understanding of atomic structures and masses. 📌 Stay Connected: 👉 Like, share, and subscribe for more educational Chemistry lectures and complete coverage of the Punjab Board syllabus! #Class9Chemistry #RelativeAtomicMass #IsotopicAbundance #PunjabBoard #NewBook2025 #ChemistryLecture #StudyWithMe #LearnChemistry #LahoreBoard #FaisalabadBoard #MultanBoard #RawalpindiBoard #SargodhaBoard #GujranwalaBoard #SahiwalBoard #ExamPreparation #EducationalContent #ScienceForPakistan #punjab #pakistan