Class 9 Chemistry Chapter 3 | Atomic Mass - Atoms and Molecules

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[@debakumarrana2098]

Ma'am how can we know or measure the mass of one carbon atom firstly?

[@jaidityagrewal8282]

Same question

[@khushisingh10thc83]

These are the the Isotopes

[@anandanand7760]

@@jaidityagrewal8282 I think it was measured by exeperiment

[@jaidityagrewal8282]

@@anandanand7760 May be

[@loofikashmir_09]

12 amu

[@rishabhgupta6403]

Maam as u show the calculation that how the atomic mass of hydrogen atoms becomes 1 u l. Please show the calculation of magnesium also that how it becomes 24 u.

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@@clashingking1450 😔

[@clashingking1450]

@@jatinprakash444 kya hua bhai atomic mass glt karke agye kya🥺

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Mam agar hum shopkeeper ke watermelon ko 12 parts katange to dukandar chapal huthake marega ek apple ke liya😂😂😂😂

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Ek apple ka mass nikalne ke liye pura water melon zaya kar diya😂😂😂but the lecture was amazing I understood everything without any confusion

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​@@MagnetBrainsEducation21:48

[@Urahara_______]

23:09 jisko yeh samjh nahi aaya 12 amu= 1 atom of C-12 1 amu= 1 atom of C-12/12(we placed 12 from the equation from lhs to rhs then it gets divides by the rhs equation because in lhs 12 is multiplied by amu)

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No

[@arpitactiwari5626]

Mam very very excellent explanation I am in class 11 and I was not understanding this concept my teacher just left it telling that we have already learnt it before.... Thank u very much mam it helped me alot... My concept is clear now

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Hey i am also in class 11 but my concepts was not clear in previous year so I was decided i drop my one year and i repeat 11th standard 😭😭😭😭my biggest mistake in my life was i don't study seriously in class 9th

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[@user-nh9ev6uy8f]

Mam in case lf 12×1/12 it gives result as 1 only ! Then can we take only 1 instead of 12×1/12????

[@angelinageorge2278]

It's the same

[@RajveerSingh16222]

Mam at 26:05 you said that we are relating mass of one atom of hydrogen which the mass of one atom of c-12 isotope, but this isn't true. Mass of one atom of c-12 isotope is 1.992*10^-23 grams. But you have written 1.66*10^-24 grams, which is the mass of "1/12th" part of the mass of one atom of c-12 isotope,(i.e. 1/12 * 1.992*10^-23 grams).

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I am studing in class 11 but i cant understand atomic mass these why i came here to understand some basic knowledge about atomic mass and now i easlily understand now i have no problems or doubt in class 11 atomic mass topic Because 9th chemistry basics knowledge is more important to understand 11 chemistry Thanq so much mam😊😊😊😊

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[@amankhan3362]

mam correct me if i am wrong but 1.66*10^-24 is the mass of 1/12 mass of one atom of C-12 not mass of one atom of C-12 or 1amu=1.66*10^-24 grams and 12 amu=mass of one atom of C-12=1.9924*10^-23 grams.

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Broo the one hydrogen atom mass is 66058 × 10^ -24 grams

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Mam but how do we know that the atomic mass of one atom of mg is 24U plzz give me answer mam🙏🙏it's my humble request

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26:09 mass of C atom 1.9926/10^23

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In atomic mass, if we already know the value of atomic mass ,than why the concept of watermelon is needed ,as in finding we have to know atomic mass of particular element for relating with C^12 If any one have answer of this question ,reply.

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[@dazzlingcreativity2005]

@@ashmakhatoon4597 I understand what are you saying but I am just asking about ; To find atomic mass by relating with C^12,we should know atomic mass of that particular element ,than why we got the concept of carbon isotopes (C^12) as standard mass

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Vinita pandey, yes I got that point in my school.

[@arjunprasad7751]

In this consept we able to know atomic mass of any element indicate the number of times one atom of an element is heavier than ½ of a C - 12 atom... For example - atomic mass of magnesium is 24 u , which means that one atom of magnesium is 24 times heavier than ½ of a C-12 atom... But the actual mass of the magnesium is 3.9852*10^-23 So this consept is given...

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Mam C-12,here what does 12 means and also tell me that how many atoms are present in C-12 element.

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12 means that uska mass 12 hai "I thinkkkkkk" as bcoz it will hv 6 neutron and 6 proton's. so , 12 uska mass hoga shyaddd

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C-12 is isotope

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Means jab ek element mein alag alag masses ke atoms present hote hain to use kahate for example c12 c13 c14 of carbon

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Mam why we compare every element with carbon -12 isotope // and what is carbon 12 isotope mam please reply BTW nice teaching

[@MagnetBrainsEducation]

Hi there! That's an excellent question. Carbon-12 is the most common isotope of carbon, and it is used as a standard for measuring the mass of other carbon atoms. I'm glad you're enjoying the videos and thank you for your comment!

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Maam I have a dought Saare elements ka unified mass hme yaad karna hoga ya fir kisi method se nikalte hai . Please tell me

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Mam, how mass of C-12 isotope calculated?

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14

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Oh for this mole concept is used

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I have problems between numerical of law of combination and mole concept

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Jisko ek bar me atomic mass samajh me nahi aarahahe double bar dekho paka samajha aajaega 👍👍👍👍👍

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Thanks

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Mam, how atomic mass of atoms is calculated by comparing mass of C-12 isotope?

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By 6.04 x 10²⁴

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[@sohinimakwana3053]

How to know the atomic mass of a particular element as how you said hydrogen has 1 amu, so how to know the atomic masses of other elements...Plzz explain

[@niveshbhardwaj1892]

It is give in periodic table. For class 9 You at least know first 30 element and their masses and no.

[@hitishakhinchi5536]

The atomic number is equal to the number of protons in an atom's nucleus. Hydrogen's atomic number is 1 because all hydrogen atoms contain exactly one proto. OVERALL no. of protons determines the atomic mass of an atom or molecule............ NOW CLEAR

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@@hitishakhinchi5536 thank you so much.. 🥰

[@alishabajaj3006]

@@hitishakhinchi5536 but i have 1 doubt .. how we will find the number protons of an element 😅

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@Alisha bajaj we have to learn atomic mass its given in ncert learn them and u can find them on internet as well learn atleast 15

[@priyanshiyadav1506]

Congratulations mam 3M ❤

[@MagnetBrainsEducation]

priyanshi Yadav, Thank you for your comment. Do recommend Magnet Brains to your friends.

[@priyanshujha_0]

Mera naam copy kar li😂😂

[@anshikarai9204]

Thank you soo much ma'am it made everything clear💕 but wanna mention one thing🙈 that when you wrote RM for relative mass..I first misunderstood it for RM of BTS🤐 Then I realised it was for relative mass😝

[@RakeshSharma-gw1lt]

You are army iam also army

[@RitaKumari-ng2zr]

Aah me too I also realized. By the way BTS army are everywhere 😂💜💜💜

[@kpop3816]

Pdhlo bcho

[@anshikarai9204]

ya BTS army are everywhere..Take me for instance😂😂😂😂

[@richa1423]

These was awesome 👍👍 I really understand it much better This was too help for my exam Superb explanation 🤩🤩

[@MagnetBrainsEducation]

Richa PATEL, Thanks for being active on the channel. Do recommend us to your friends.

[@richa1423]

@@MagnetBrainsEducation 🤩

[@fatimatuzzahra3324]

Mam you are the best because my teacher don't use simple language to teach but I relaxed because I know Magnet brains is here...

[@MagnetBrainsEducation]

Fatima Tuzzahra, Thanks a lot for checking out the video and replying back. Do recommend Magnet Brains to your friends. Also do checkout the Magnet Brains website, all video lectures are organized on the site for easy access.

[@ktpandit..4493]

Very good explanation of Atomic mass.. Thanks mam for this video..

[@MagnetBrainsEducation]

Khushbu Khushbu, Thank you for your comment. Do recommend Magnet Brains to your friends.

[@ktpandit..4493]

Okk mam

[@madboy331]

@@MagnetBrainsEducation hii maam this topic is quite different but you explained it so easily.

[@meenakshiarora35]

Very nice explanation ma'am... Video was very helpful 😃

[@riasingh3463]

Mam plz also post the recently last video link because sometimes we r not able to find the previous video

[@vritisharma2546]

Mam pls tell atom k 1 element ka ky mass h .. Numerator m ky lana h hr baari mam ?? Hme kase pta 😑😑😑😑😑🙏🙏🙏pls tell me anyone 😟😢

[@twinklepaliwal8598]

Mam aapne watermalon la exapmple diya usme aapne water malon 12 part kiye To mam C12 1 atom ko 1/12 yani man c12 ke 1 atom ko aapne 12 Baar divide kiya lekin mam atom to indivisible he... Pls clarify it!!Mam😊I am so Confused .....🤔

[@MagnetBrainsEducation]

Twinkle Paliwal, Thanks for the reply. Wherever possible, please recommend us to your friends.

[@funwithme8470]

@@MagnetBrainsEducation ma'am vo aapse question clear karne bol rahi hai.aap to kuch aur hi reply kiye😅😎

[@joshuagomez5952]

Twinkle, we are not really dividing the atom. WE are just taking mass of atom and dividing it using numbers.And calculating the estimate.

[@joshuagomez5952]

This way we will get a standard reference and compare other atoms

[@saijakdebbarma4842]

If u do self study before watching this vedio carefully, than the concept is easy

[@raj949077]

15:00 didi isse acha hum tarbooz hi na lele 😂😂😂

[@ArshadKhan-pq6ss]

Great lecture👍

[@yaarmohd4140]

Mam you are saying that if we want to know the atomic mass so we should take the atom's mass and compare it with the standard element here standard element is carbon we don't know the mass of atom so how we compare it to standard For example I want to know the atomic mass of oxygen here I don't know it's mass so how can I compare it to carbon- 12?????????🤔🤔🤔

[@nigamkumari1436]

Mam. You are best teacher. Your explanation is really amazing.

[@MagnetBrainsEducation]

Nigam Kumari, Thanks a lot for watching the Magnet Brains videos. Please recommend us among your friends.

[@tanyashrivastava5824]

Free education with best teachers ❤️💫. Thankyou magnet brains🤞🏻

[@anusinghal3109]

This video is very helpful...I clear my all doubts

[@aeniiiyy]

Thanks maget brain for teaching in a best way

[@MagnetBrainsEducation]

rustana Choudhury, Thank you for your comment. Do recommend Magnet Brains to your friends.

[@info_hours]

If the Atomic Mass of Hydrogen AnD Carbon is Approximately same in Grams then Why there is Too much difference in AMU??

[@chaitaliparab9934]

Thank you so much ma'am.....😇❤️ finally I understand this.....💯✨