Question

The number of neutron present in a drop of water 20drops=1ml at 4°C

Answer 1

answer;The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfuric Acid, or 98.07848 grams

Answer 2

drop of water = 1/20 mL

density of water at 4 °C= 1 g/mL

so mass of 1 drop of water = density x volume =(1 x 1/20) = 0.05 gm

mass of 1 mole of water = 18 gm

1 mole of water contains = 6.23 x 1023 molecules of H2O (Avogadro's number)

1 drop of water contains = (mass of 1 drop /18) moles

= (1/20 x 1/18 ) = 0.00277 moles

So number of molecules in 1 drop of water = 0.00277 x 6.23 x 1023

= 17.3 x 1020 molecules (of H2O)

1 molecule of H2O contains = 8 neutons (from oxygen only),

so number of neutrons in 1 drop of water = 8 x (17.3 x 1020 )

= 1.38 x 10 22 neutrons