According come this site the median 70kg body has 7*1027 or 7,000,000,000,000,000,000,000,000,000 atoms. That which

Hydrogen: proton 4.71027 neutrons 0 electrons 4.71027

Oxygen: proton 1.41028 neutron 1.41028 electrons 1.4*1028

Carbon: proton 4.21027 neutron 4.21027 electron 4.2*1027

Total proton 2.31028 neutron 1.81028 electrons 2.3*1028

so in full you weigh around 230000000000000000000000000000 electrons. Offered that 1 electron = 9.10938291 ×10−31 kg we deserve to calculate your total mass made up of electrons as 9.10938291 ×10−31 * 2.3*1028 which equals

0.0209515807 kg or 20.9515807 grammes

edit: formatting




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· 6y
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20.9515807 grammes

Significant figures, yo. 72 kg is just 2.


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level 1
· 6y · edited 6y
Here's my different solution:

Our bodies are around 70% water and also the rest largely Carbon. Each water molecule has 10 electrons and also 18 nucleons (protons and also neutrons). Carbon has actually 6 electrons and also 12 nucleons. Therefore there are 0.7*10/18+0.3*6/12 = 97/180 electrons every nucleon.

Electrons are around 1/1800 the massive of a nucleon for this reason we can estimate the fixed of electrons by (97/180)*(1/1800)*72kg = 21.56 grams

I'm pleasantly surprised through the agreement between this and /u/the-pinnacle's answer


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· 6y · edited 6y
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Electron weight is basically negligible contrasted to the fixed of protons/neutrons (at the level that precision you have actually supplied, 72 kg of your mass is protons/neutrons v some gravy mass added as electrons). Suspect one proton and also one neutron for every electron (not entirely accurate, due to the fact that hydrogen, however close enough due to the fact that a most the weight is carbon/oxygen/nitrogen), friend get around 20 grams.

http://www.wolframalpha.com/input/?i=72+kg+%2F+%28%28mass+of+neutron+%2B+mass+of+proton%29%29+*+mass+of+electron


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· 6y
BEEP BOOP

Input interpretation

(72 kg (kilograms))/(n (neutron) | mass+p (proton) | mass) e^- (electron) | massImage

Result

0.0195927 kg (kilograms)Image

Unit conversion

19.59 gramsImage

Delete (comment writer only^) | ^About | Report a bug | Created and maintained through /u/JakeLane


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