Question

The number of water molecules in a drop of water weighing 0.018 g is
(a) 6.022 x 10²⁶
(b) 6.022 x 10²³
(c) 6.022 x 10²⁰
(d) 9.9 x 10²²

Answer 1

The number of water molecules in a drop of water weighing 0.018 g is:

Option C:6.022 x 10²⁰

Explanation :

1mole of water=18g
0.018g------? moles
Number of moles=0.018/18=0.001 moles of water.

1mole of water[ 18g ] contains 6.022 x 10²³ molecules .
0.001 moles contain ---------? molecules
=0..001x6.022 x 10²³
=6.022x10²⁰ molecules 

∴The number of water molecules in a drop of water weighing 0.018 g is 6.022x10²⁰ molecules 

Answer 2

The number of water molecules in a drop of water weighing 0.018 g is:

Option C:6.022 x 10²⁰

Explanation :

1mole of water=18g

0.018g------? moles

Number of moles=0.018/18=0.001 moles of water.

1mole of water[ 18g ] contains 6.022 x 10²³ molecules .

0.001 moles contain ---------? molecules

=0..001x6.022 x 10²³

=6.022x10²⁰ molecules 

∴The number of water molecules in a drop of water weighing 0.018 g is 6.022x10²⁰ molecules 

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