Top topic this week
Back to FAQs
Related FAQs
Frequently Asked Question
Questions asked by users might not always be phrased in the clearest way.
50cm³ of hydrogen peroxide, which has a concentration of 2.0mol/dm³ is decomposed. the equation of the reaction is 2h₂o₂.=2h₂o+o₂. how many moles of hydrogen peroxide are there in 50 cm³of a solution containing 2.0mol/dm³ (ii) How many moles of oxygen formed when 50cm³ of the hydrogen peroxide decomposes?
Accepted Answer
Here's how to solve this problem:
(i) Calculating moles of hydrogen peroxide:
Convert cm³ to dm³: 50 cm³ = 0.05 dm³
Use the formula: moles = concentration × volume
Calculate: moles of H₂O₂ = 2.0 mol/dm³ × 0.05 dm³ = 0.1 moles
(ii) Calculating moles of oxygen formed:
From the balanced equation: 2 moles of H₂O₂ decompose to form 1 mole of O₂.
Use the mole ratio: (1 mole O₂ / 2 moles H₂O₂) × 0.1 moles H₂O₂ = 0.05 moles O₂
Therefore, there are 0.1 moles of hydrogen peroxide and 0.05 moles of oxygen formed.
Articles you might like