Question

what is mass of :{1}4 moles of aluminium atoms. {2}10 moles of sodium sulphate (Na2So3). {3}0•5 mole of water molecular​

Answer 1

Answer:{1} 108 g

{2}1420 g (1.42 kg)

{3}9 g

Explanation:

{1} Al = 27 g mol-1

M=m/n ; m=M x n

= 27 g mol-1 x 4 mol

m(Al) = 108 g

{2} molar mass of Na2So3 = 142 gmol-1

m= M x n;

= 142 gmol-1 x 10 mol

= 1420 g (1.42 kg)

{3} molar mass of H2o = 18.0 g mol-1

m= M x n;

= 18.0 g mol-1 x 0.5 mol

= 9.0 g

Answer 2

Question :-

What is the mass of

(a) 1 mole of nitrogen atoms?

(b) 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?

(c) 10 moles of sodium sulphite (Na2S03)?

Answer :-

(a) Mass of 1 mole of nitrogen atoms = 14 g

(b) 4 moles of aluminium atoms

Mass of 1 mole of aluminium atoms = 27 g

∴ Mass of 4 moles of aluminium atoms = 27 x 4 = 108 g

(c) 10 moles of sodium sulphite (Na2SO3)

Mass of 1 mole of Na2SO3 = 2 x 23 + 32 + 3 x 16 = 46 + 32 + 48 = 126 g

∴ Mass of 10 moles of Na2SO3 = 126 x 10 = 1260 g

Plz mrk as brainliest ❤