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anastassius [24]
3 years ago
6

A medical lab technician measures the mass of cholesterol in a blood sample. the mass is ×3.58110−5g . what is the mass in micro

grams? write your answer as a decimal.
Chemistry
1 answer:
motikmotik3 years ago
7 0

Answer :

The correct answer is  35.81 micro gram.

Given : Mass of cholesterol = 3.581 * 10⁻⁵ g

Mass of g need to be converted to micro gram . Following steps can be involves :

<u>Step 1 : Find the conversion factor :</u>

1 gram = 1000000 micro gram or  10⁶ micro gram


<u>Step 2 : To do the conversion :</u>

Start with what is given  and multiply with the conversion factor :

Mass of cholesterol = 3.581 * 10^-^5 g  * \frac{10^6 micro gram}{1 g}

Grams being on top as well on bottom , get cancelled . Hence  micro gram is left as unit .

Mass of cholesterol = 3.581 *10^-^5 * 10^6  micro gram

Mass of cholesterol = 3.581 * 10¹  micro gram

Mass of cholesterol = 35.81 micro gram



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<u>Answer:</u> The value of \Delta H for the reaction will be -537 kJ

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

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Given mass of hydrogen gas = 0.647 g

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Putting values in above equation, we get:

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We are given:

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For the given chemical reaction:

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By Stoichiometry of the reaction:

When 0.324 moles of hydrogen gas is reacted, the energy evolved is 174 kJ

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<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

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6 0
3 years ago
A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. What is the weight/
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Answer:

A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. The weight/weight % or percent by mass of the solute is :

<u>2.67%</u>

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Note : Look at the density of potassium nitrate in water if given in the question.

<u><em>You are calculating </em></u><u><em>weight /Volume</em></u><u><em> not weight/weight % or percent by mass of the solute</em></u>

Here the <u>weight/weight % or percent by mass</u> of the solute is asked : So first convert the<u> VOLUME OF SOLUTION into MASS</u>

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2.11=\frac{mass}{86.4}

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w/w% of the solute =

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