Respuesta :
Answer:
0.67 g
Explanation:
Data given
water (H₂O) = 6 g
Mass of Hydrogen = ?
Electrolysis of water
2H₂O --------> 2H₂ + O₂
Solution:
In hydrolysis of water the water molecule splits in hydrogen and oxygen
2H₂O --------> 2H₂ + O₂
So, we know from reaction that 2 mole of water molecule splits in 2 mole of hydrogen and 1 mole of oxygen
2H₂O --------> 2H₂ + O₂
2mol 2 mol
If we represent mol in grams
Then,
Molar mass of water (H₂O) = 2(1) + 16
Molar mass of water (H₂O) = 18 g/mol
2H₂O --------> 2H₂ + O₂
2 mol (18 g/mol) 2 mol (2 g/mol)
2H₂O --------> 2H₂ + O₂
36 g 4 g
It is obvious from the reaction that 36 g of water give 4 g of hydrogen on electrolysis.
Then how many grams of hydrogen will produce if 6 grams of water electrolyzed
apply unity formula
36 g of H₂O ≅ 4 g of H₂
6 g of H₂O ≅ x g of H₂
By doing cross multiplication
g of H₂ = 4 x 6 / 36
g of H₂ = 0.67 g
0.67 g of hydrogen will produce if 6 grams of water is electrolyzed
