Question

In a batch process, 70 Kg of H₂O and 10 Kg of NaOH and some other reactants enters the vessel. If 100 Kg of the product leaves the vessel, what is the percentage of H₂O in the product?

• A. 10\%
• B. 30\%
• C. 70\%
• D. 100\%

Hint:

In batch processes, the percentage of each component in the product can be calculated by dividing the mass of the component by the total mass of the product.

Answer 1

The Correct Option is C

To calculate the percentage of H₂O in the product, we use the following formula: \[ \text{Percentage of H₂O in product} = \frac{\text{Weight of H₂O in product}}{\text{Total weight of product}} \times 100 \]
(1) The total weight of reactants entering the vessel is: \[ \text{Total reactant weight} = 70 \, \text{Kg of H₂O} + 10 \, \text{Kg of NaOH} = 80 \, \text{Kg} \]
(2) If 100 Kg of product leaves the vessel, we assume that all 70 Kg of H₂O is present in the product. Therefore, the weight of H₂O in the product is 70 Kg.
(3) The percentage of H₂O in the product is: \[ \text{Percentage of H₂O} = \frac{70}{100} \times 100 = 70\% \]
Conclusion: The correct answer is Option 3: 70\% as it represents the percentage of H₂O in the product.