Question

how many molecules are there in one glass of water.(I want exact answer; do not cheat from the Google)

Answer 1

Heya!
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◾How many molecules are there in one glass of water ?

⭐Water => H2O

◽Molecular Mass =

▫Atomic Mass of Hydrogen = 1.00784 u

▫Atomic Mass of Oxygen = 15.9994 u

⭐Molecular Mass of Water => 2 × ( 1.00784 ) + 15.9994

=> 18.01508 u


◾Now one glass of water contains approx. 200gms of water .


⭐Avagadro Number => 6.022 × 10²³ molecules .

⭐Hence 18.01508 gms = 6.022× 10²³ molecules .

$= > one \: gram \: contains \: = \frac{6.022 \times 10 {}^{23} }{18.01508} molecules \\ \\ = > 200gms \: contain \: = > \frac{6.022 \times 10 {}^{23} }{18.01508} \times 200 \\ \\ = > > 6.6855 \times 10 {}^{24} molecules$
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Answer 2

___________Heya Mate___________
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» As We know That :-

» Density of Water = 1 gm/ml

Then

» 1 mole of water takes = 18 ml of volume.

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Now,

» one glass ≈ 250 ml (Approximate)

» then one glass of water contain

= 250/18 mole of water.

= 13.88 mole of water.


Then

» One mole of water contain = 6.023×10^23



» 13.88 mole of water contain = 13.88 × 6.023×10^23 = 8.36×10^24 molecules of water.

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