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3 years ago

Why would it be difficult to sift the iron fillings from the sand

Chemistry

1 answer:

slamgirl [31]3 years ago

5 0

Explanation:

Sand and iron fillings have the same size of particles.

It would be difficult to use a mesh to separate them. Also, sometimes , the iron filing clings well to the surface of the sand particles.

The best way to separate them is to use a bar magnet. The magnetic properties of the iron fillings will get it attracted to the bar magnet leaving the sand particles behind.

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Extraction brainly.com/question/5881840

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jekas [21]

Answer:

The % yield is 74.45 %

Explanation:

Step 1: The balanced equation

C6H12O6⟶2CH3CH2OH+2CO2

Step 2: Data given

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Molar mass of ethanol = 46.08 g/mol

Molar mass of carbon dioxide = 44.01 g/mol

Mass of glucose = 61.5 grams

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Step 3: Calculate moles of glucose

Moles glucose = Mass glucose / Molar mass of glucose

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Moles glucose = 0.341 moles

Step 4: Calculate moles of ethanol

1 mole of glucose consumed, produces 2 moles of ethanol and 2 moles of CO2

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Step 5: Calculate mass of ethanol

Mass ethanol = moles ethanol * Molar mass ethanol

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Mass ethanol = 31.43 grams = theoretical mass

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