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ladessa [460]
4 years ago
9

How many mL of a stock 50% (w/v) KNO3 solution are needed to prepare 250 mL of a 20% (w/v) KNO3 solution?

Chemistry
1 answer:
Andre45 [30]4 years ago
6 0

Answer:

100ml of a stock 50% KNO3 solutions are needed to prepare 250ml of a 20% KNO3 solution.

Explanation:

In the given question it is mentioned that

     S1=50%

      V2=250ml

      S2= 20%

We all know that

                     V1S1=V2S2

                     ∴V1=  V2×S2÷S1

                     ∴V1=  V2S2×1/S1

                      ∴V1= 250×20÷50

                       ∴V1= 100ml

 

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The question is incomplete, here is the complete question:

Suppose the reaction is:

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If 6 moles of A and 2 moles of B are reacted, what is the maximum number of moles of C that can be formed

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<u>Explanation:</u>

We are given:

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So, 2 moles of B will react with = \frac{1}{2}\times 2=1 mole of A

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Thus, B is considered as a limiting reagent because it limits the formation of product.

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Learn more about problems with number of moles:

brainly.com/question/3262

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