KVPY SA Exam 2018 Question Paper

Question : 31 of 80

Marks: +1, -0

CHEMISTRY

The number of water molecules in 250 mL of water is closest to
[Given : Density of water is 1.0 g mL

^{–1}

; Avogadro’s number = 6.023 × 10

^{23}

]

Solution:

Volume of

H_2O

= 250ml,
Weight of water = 250 gm,
Number of male of

H_2O =250/18

Number of molecule of

H_2O =250/18×N_A= 83.6×10^23

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