According to this website the average 70kg body has 7*1027 or 7,000,000,000,000,000,000,000,000,000 atoms. That which

Hydrogen: protons 4.71027 neutrons 0 electron 4.71027

Oxygen: protons 1.41028 neutrons 1.41028 electrons 1.4*1028

Carbon: protons 4.21027 neutron 4.21027 electrons 4.2*1027

Total proton 2.31028 neutron 1.81028 electrons 2.3*1028

so in complete you weigh roughly 230000000000000000000000000000 electrons. Provided that 1 electron = 9.10938291 ×10−31 kg we deserve to calculate your full mass comprised of electrons together 9.10938291 ×10−31 * 2.3*1028 i beg your pardon equals

0.0209515807 kg or 20.9515807 grammes

edit: formatting




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level 2
· 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 alternative solution:

Our body are around 70% water and the rest greatly Carbon. Every water molecule has actually 10 electrons and also 18 nucleons (protons and neutrons). Carbon has actually 6 electrons and also 12 nucleons. As such there room 0.7*10/18+0.3*6/12 = 97/180 electrons per nucleon.

Electrons are about 1/1800 the fixed of a nucleon for this reason we deserve to estimate the mass of electrons by (97/180)*(1/1800)*72kg = 21.56 grams

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


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· 6y · edited 6y
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Electron load is usually negligible compared to the mass of protons/neutrons (at the level of precision you have supplied, 72 kg of her mass is protons/neutrons through some gravy mass added as electrons). Presume one proton and also one neutron for every electron (not entirely accurate, since hydrogen, but close enough due to the fact that a the majority of the load is carbon/oxygen/nitrogen), you get about 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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level 2
· 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 author only^) | ^About | Report a an insect | Created and maintained by /u/JakeLane


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