Question

What mass of H2 is needed to react with 8.75 g of O2 according to the following equation: O2(g) + H2(g) → H2O(g)?

Answer 1

Mass of H₂ needed to react with O₂ : 1.092 g

Further explanation

The concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.

Reaction

O₂(g) + 2H₂(g) → 2H₂O(g)

mass of O₂ : 8.75 g

mol O₂(MW=32 g/mol) :

$\tt \dfrac{8.75}{32}=0.273$

From the equation, mol ratio of O₂ : H₂ = 1 : 2, so mol H₂ :

$\tt \dfrac{2}{1}\times 0.273=0.546$

Mass H₂ (MW=2 g/mol) :

$\tt 0.546\times 2=1.092~g$

Answer 2

Answer:

Mass of H₂ needed to react with O₂ : 1.092 g

Explanation: