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2 years ago

If the absorbance of the 10μM solution is 0.24, what should be the absorbance of the 50μM? Write answer to two decimal places.

1 answer:

3 0

Absorbance/Concentration = Constant.

That is, absorbance is directly proportional to concentration.

Therefore,

0.24/10 = x/50, where x is the absorbance at 50 micro m.

Calculating for x;
x=50* (0.24/10) = 1.20 (correct to 2 decimal places)

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ser-zykov [4K]

Answer:

Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.

Explanation:

Chemical change involves formation of new substances. Therefore, the correct answer is "Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form."

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2 years ago

Devices that mix air or oxygen with flammable gasses cannot be used unless approved by

Feliz [49]

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2 years ago

4. A 0.51 kg solution contains 87 mg of potassium iodide. Calculate the W/W concentration

anzhelika [568]

Taking into account the definition of percentage composition, the percent composition of potassium iodide in this sample is 0.017%.

<h3>Definition of percent composition </h3>

The Percentage Composition is a measure of the amount of mass that an element occupies in a compound and indicates the percentage by mass of each element that is part of a compound.

To calculate the percentage of composition, it is necessary to know the mass of the element in a known mass of the compound.

<h3>Percentage Composition in this case</h3>

In this case, you know that a 0.51 kg (or 510000 mg, being 1 kg= 1000000 mg) solution contains 87 mg of potassium iodide.

Dividing the mass amount of potassium iodide present in the compound by the mass of the sample and multiplying it by 100 to obtain a percentage value, the percentage composition of potassium iodide is obtained:

$percentage composition of potassium iodide=\frac{87 mg}{510000 mg} x100$

percentage composition of potassium iodide= 0.017%

Finally, the percent composition of potassium iodide in this sample is 0.017%.

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2 years ago

How do oil spills affect marine ecosystems?

charle [14.2K]

Oil makes it impossible for fur-bearing mammals to insulate, this leaves them unprotected from the harsh elements out in the water. Birds and mammals will die from hypothermia without the ability to insulate from the freezing water.

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2 years ago

How many moles of ammonium nitrate will be produced 110.0g of ammonium carbonate

marshall27 [118]

Answer:

2.288 Moles of NH₄NO₃

Explanation:

The Balance chemical equation is as follow:

(NH₄)₂CO₃ + 2 HNO₃ → 2 NH₄NO₃ + H₂O + CO₂

To solve this problem we will do following steps:

Finding moles of Ammonium Carbonate:

As we know,

Moles = Mass / M.Mass

So,

Moles = 110 g / 96.08 g/mol

Moles = 1.144 moles

Calculating moles of Ammonium Nitrate:

According to balance chemical equation;

1 mole of (NH₄)₂CO₃ produces = 2 moles of NH₄NO₃

So,

1.144 moles of (NH₄)₂CO₃ will produce = X moles of NH₄NO₃

Solving for X,

X = 2 moles × 1.144 moles ÷ 1 mole

X = 2.288 moles of NH₄NO₃

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3 years ago