Answer:
10.56g
Explanation:
From the reaction equation, we can see that it is unbalanced. In the balanced state, 2 moles of KClO3 will yield 3 moles oxygen.
Let's calculate the actual number of moles now. We first divide the mass of the KClO3 by the molar mass. Molar mass of KClO3 = 39 + 35.5 + 3(16) = 122.5g/mol
The number of moles is thus 26.4/122.5 = 0.22 mole
If 2 moles KClO3 gave 3 moles O2, this means 0.22 moles will give (0.22 × 3)/2 = 0.33 mole
To calculate the mass of oxygen formed, we multiply the molecular mass of oxygen molecule by the number of moles
The molecular mass of oxygen molecule = 16 × 2 = 32g/mol
The mass formed = 32 × 0.33 = 10.56g
