Class 11 | मोल अवधारणा | Mol Avadarana | Mole Concept | रसायन विज्ञान | Vipin Sir

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Mole Concept (मोल अवधारणा)|Mass Percentage Of An Element From Molecular Formula|Mass Percentage (द्रव्यमान प्रतिशत)|Volume Percentage (आयतन प्रतिशत)|Mass-Volume Percentage (द्रव्यमान-आयतन प्रतिशतता)|सारांश

Energy of an electron in the ground state of the hydrogen atom is -2.18xx10^(-18)J . Callate the ionisation enthalpy of atomic hydrogen in terms of kJ mol^(-1) . Hint: Apply the idea of mole concept to derive the answer.

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Energy of an electron in the ground state of the hydrogen atom is -5.19 xx 10^(-19)Cal . Calculate the ionization enthalpy of atomic hydrogen in terms of Kcal//mol . Hint: Apply the idea of mole concept to derive the answer.

According to the Avogadro's law , equal number of moles of gases occupy the same volume at identical conditions of temperature and pressure. Even if we have a mixture of non-reacting gases then Avogadro's law is still obeyed by assuming mixture as a new gas. Now let us assume air to consist of 80% by volume of nitrogen (N_(2)) and 20% by volume of oxygen (O_(2)) . If air is taken at STP , then its 1 mol would occupy 22.4 L . 1 mol of air would contain 0.8 mol of N_(2) and 0.2 mol of O_(2) hence the mole fraction of N_(2) and O_(2) are given by X_(n_(2))=0.8, X_(o_(2))=0.2 Volume occupied by air at STP containing exactly 11.2 gm f nitrogen:

In the following question, two statements are given each followed by two conclusions I and IL You have to consider the statements to be true even if they seem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement : I. We are going back again to our ancestors and finding out the importance of Yoga and Pranayam. II. People in west have already opted it. It does not require any external equipment but only body and soul. , Conclusions : I. Ancient science is treasure of many cures and natural remedies of various diseases. II. Technology has overshadowed these ancient sources and introduced new concepts of fitness called gym. / निम्नलिखित प्रश्न में, दो कथन दिए गए हैं जिनके आगे दो निष्कर्ष I और II निकाले गए हैं। आपको मानना है कि कथन सत्य है चाहे वे सामान्यतः ज्ञात तथ्यों से भिन्न प्रतीत होते हों। आपको निर्णय करना है कि दिए गए निष्कर्षों में से कौन-सा निश्चित रूप से कथनों द्वारा सही निकाला जा सकता है/सकते हैं, यदि कोई हो। कथनः I. हम फिर से अपने पूर्वजों की ओर लौट रहे हैं और योग तथा प्राणायाम के महत्व को समझ रहे हैं। II. पश्चिम के लोगों ने इसे पहले से ही अपना रखा है। इसके लिए किसी बाहरी उपकरण की जरूरत नहीं है, केवल आत्मा और शरीर चाहिए। निष्कर्ष : I. प्राचीन विज्ञान कई इलाजों का खजाना और विभिन्न रोगों का प्राकृतिक उपचार है। II. प्रौद्योगिकी ने इन प्राचीन स्रोतों को दबा दिया है और स्वस्थ रहने के लिए नई अवधारणा को जन्म दिया है जिसे जिम कहते हैं।