Question

. The number of molecules in 10L of water is Options: (a) 6 1023 22.4  (b) 3.331025 (c) 3.331023 (d) 3.331026

Answer 1

Answer:

n.o of moles =volume(in L)/22.2

N.o of moles=0.446

N.o of molecules =6.023×10^23×N.o of moles

n.o of molecules=6.023×10^23×0.446

n.o of molecules =2.6865×0^23

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Answer 2

(d) 3.33 × 10²⁶

No of moles = given mass / molecular mass

Molecular mass of H₂O = 18g

Given mass = 10L = 10 × 1000g = 10000 g

No of moles in 10L of water = 10000 g / 18 g

= 555.55 moles

One mole of water has 6.022 × 10²³ ( avogadro number ) molecules.

No of molecules in 555.55 moles of water

= 555.55×6.022 × 10²³

= 3.33 × 10²⁶

The number of molecules in 10L of water

= 3.33 × 10²⁶

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