Question

calculate the mass of 0.4 moles of water

Answer 1

Hii friend
Since we know the formula :- 1 mole=g-molecular weight
So, 1 mole of water=18g
Hence,0.4 moles of water=0.4×18=7.2
Hope it helps

Answer 2

Here is your answer
-------------------------------

1 mole => G - Molecule of water

_______________

$we \: know \: that \:$
-------- 1 Mole of water => 18 G -------


===================================================


According to question, there are 0.4 Moles

so,
$= > 0.4 \times 18 \\ = > 7.2$