Question #b19de

1 Answer
Jul 22, 2017

Answer:

The number of water molecules is maximum in b) 18 mol of water.

Explanation:

We must calculate the number of molecules in each case.

a) 1.8 g of water

#"Molecules of water"#

#= 1.8 color(red)(cancel(color(black)("g water"))) × (1 color(red)(cancel(color(black)("mol water"))))/(18.02 color(red)(cancel(color(black)("g water")))) × (6.022 × 10^23 color(white)(l)"molecules water")/(1 color(red)(cancel(color(black)("mol water"))))#

#= 6.02 × 10^22color(white)(l) "molecules water"#

b) 18 mol of water

#"Molecules of water"#

#= 18 color(red)(cancel(color(black)("mol water"))) × (6.022 × 10^23 color(white)(l)"molecules water")/(1 color(red)(cancel(color(black)("mol water"))))#

#= 1.08 × 10^25color(white)(l) "molecules water"#

c) 18 g of water

#"Molecules of water"#

#= 18 color(red)(cancel(color(black)("g water"))) × (1 color(red)(cancel(color(black)("mol water"))))/(18.02 color(red)(cancel(color(black)("g water")))) × (6.022 × 10^23 color(white)(l)"molecules water")/(1 color(red)(cancel(color(black)("mol water"))))#

#= 6.02 × 10^23color(white)(l) "molecules water"#

d) 18 molecules water

We have 18 molecules of water.

There are the most water molecules in Option b).