A chemistry student needs 90.00 g of thiophene for an experiment. She has available 0.50 kg of a 12.3% w/w solution of thiophene in ethanol.

Question

A chemistry student needs 90.00 g of thiophene for an experiment. She has available 0.50 kg of a 12.3% w/w solution of thiophene in ethanol.
Calculate the mass of solution the student should use. If there’s not enough solution, press the ‘No solution” button
Round your answer to 3 significant digits. Put the answer in terms of the amount of grams.

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Huyền Thanh 2 months 2021-07-30T10:30:25+00:00 1 Answers 7 views 0

Answers ( )

    0
    2021-07-30T10:32:10+00:00

    Answer: The correct answer is No solution.

    Explanation:

    We are given:

    Given mass of thiophene for the experiment = 90.00 g

    12.3% w/w solution of thiophene

    This means that 12.3 g of thiophene is present in 100 g of solution

    Applying unitary method:

    If 12.3 g of thiophene is present in 100 g of solution

    So, 90.00 g of thiophene will be present in \frac{100g}{12.3g}\times 90.00g=731.7g of solution

    Converting it into kilograms:

    1 kg = 1000 g

    So, 731.7 g = 0.7317 kg

    As the given amount of solution is 0.50 kg which is less than the required amount.

    Thus, there is not enough solution the student should use.

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