contestada

The decomposition of water produces 50g of Hydrogen gas and 75 g of oxygen gas. How much water
decomposed?

Respuesta :

84.24 g of water (H₂O)

Explanation:

We have the following chemical reaction:

2 H₂O → 2  H₂ + O₂

Now we calculate the number of moles of products.

number of moles = mass / molar weight

number of moles of H₂ = 50 / 2 = 25 moles

number of moles of O₂ = 75 / 32 = 2.34 moles

We see from the chemical reaction that for every 2 moles of H₂ produced there are 1 mole of O₂ produces for every 25 moles of H₂ produced there are 12.5 moles of O₂ but we only have 2.35 moles of O₂ available. The O₂ will be the limiting quantity from which we devise the following reasoning:

if        2 moles of H₂O  produces 1 mole of O₂

then  X moles of H₂O  produces 2.34 mole of O₂

X = (2 × 2.34) / 1 = 4.68 moles of H₂O

mass = number of moles × molar weight

mass of H₂O = 4.68 × 18 = 84.24 g

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