Respuesta :
Answer:
45.4 g
Explanation:
Data given:
mole of oxygen = 1.26 mol
mass of water = ?
Reaction Given:
2H₂ (g) + O₂(g) --------> 2H₂O (g)
Solution:
To solve this problem we look for mole mole ratio oxygen to water we look for the chemical reaction
2H₂ (g) + O₂(g) ----------> 2H₂O (g)
1 mole 2 mol
So,
It is clear from the reaction that 1 mole oxygen gives 2 mole water then how many mole of water will produce by 1.26 moles of oxygen.
So apply unity formula
2 moles H₂O ≅ 1 mole O₂
X moles H₂O ≅ 1.26 mole O₂
Do cross multiplication
X moles H₂O = 2 mol x 1.26 mole / 1 mole
X moles H₂O ≅ 2.52 mol
So,
1.26 mole of oxygen produce 2.52 mole of water.
Now convert moles of water to mass
Formula will be used
mass in grams = no. of moles x molar mass
molar mass of water (H₂O)
molar mass of H₂O = 2(1) + 16
molar mass of H₂O = 2 + 16 = 18 g/mol
put value in above equation:
mass in grams = 2.52 mole x 18 g/mol
mass in grams = 45.4 g
So,
1.26 moles oxygen produce 45.4 g water
