| 8th October 2016 02:43 PM | |
| shikha | Re: Mole concept iit jee As you Asking for the Notes on the Topic of Mole Concept of the IIT JEE Examination the Notes on the Topics of the Mole Concept Are given below Atoms and molecules are too small to count. To solve this problem their numbers are expressed in terms of Avogadro’s number (NA = 6.023 1023). Mole is the number equal to Avogadro’s number just like a dozen is equal to 12, a century means 100, a score means = 20. 1.1 Every measured physical quantity consists of two parts viz a numerical value and the unit. Physical quantity = numerical value ×unit 1.2 The numerical value of a physical quantity is determined experimentally. Every scientific measurement has some degree of uncertainty due to two reasons. (i) Skill of the observer (ii) Limitation of measuring instrument 1.3 There are two ways of expressing this uncertainty . (i) One method of expressing it is to use the notation +1 along with the doubtful digit. Ex.1 :63.7 +0.1cm. (ii) Another method is expressing it is to use the concept of significant figures. 1.4 Rules for determining the number of significant figures: Rule (i) All nonzero digits are significant Ex.2 : 6.324 has four significant figures. 7.92 has three significant figures 1.2 has two significant figures. Rule (ii) A zero appearing at a beginning of a number is not significant Ex.3 : 0.32 has two significant figures 0.018 has two significant figures. 0.0004 has one significant figure. 0.324 has three significant figures. Rule (iii) A zero appearing in the middle of a number or at the end of a number that included a decimalpoint is significant. the Notes on the Topic of Mole Concept of the IIT JEE Examination  |
| 8th October 2016 01:24 PM | |
| Unregistered | Mole concept iit jee Hii sir, I am Preparing for the IIT JEE Examination I wants to get the Notes on the Topic of Mole Concept of the IIT JEE Examination ? |
