Question

Q=> What is the mass of :
(a) 0.2 mole of oxygen atoms ?
(b) 0.5 mole of water molecules ?

CONTENT QUALITY REQUIRED
NO SPAMMING

Answer 1

Hi there ^_^

▪SOLUTION▪

________________________

(a) The atomic mass of oxygen (O) is 16 u. So, the mass of 1 mole of oxygen atoms will be 16 grams.
Now, 1 mole of oxygen atoms = 16 g
So, 0.2 mole of oxygen atoms = 16 × 0.2 g
= 3.2 g

(b) The molecular mass of water (H2O) is 18 u, so the mass of 1 mole of water molecules is 18 grams.
Now, 1 mole of water molecules = 18 g
So, 0.5 mole of water molecules = 18 × 0.5 g
= 9 g

________________________

Hope it helps ^_^

Answer 2

$\huge\blue{As-Salamu-Alykum}$


_______________

$\huge\green{Part :- a }$


Moles of oxygen atom = 0.2mol


Mass of O = ?


Molar mass of oxygen atom = 16g/mol


Now........


Mass of O = Moles × Molar mass


Mass of O = 0.2 × 16


Mass of O = 3.2 g


$\huge\purple{Part : b }$


Moles of water = 0.5 mol


Molar mass of H2O = 1×2 +16 =18g/mol


Mass of H2O = Moles × Molar mass


Mass of H2O = 0.5 × 18


Mass of H2O = 9g


___________________


$\huge\blue{INSHALLAH it will help U}$