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elena-s [515]
3 years ago
5

Can somebody plz tell me which one I should circle for each question thanks!!!

Chemistry
2 answers:
marusya05 [52]3 years ago
7 0

Answer:

1. False

2. True  

3. True

4. True

5. False

Explanation:

Softa [21]3 years ago
7 0

Answer:

1. False (All compounds are molecules but not all molecules are compounds)

2. True (elements make up a compound by combining chemically together)

3. True (water is a molecule consisting of 3 atoms and 2 hydrogen that bond together)

4. True (they are made by humans using different nature uses and chemical structures that cannot be found in nature)

5. False (a compound is made up of two or more different atoms that can bond or be broken down into simpler compounds)

Hope this helps:)

Explanation:

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What is the empirical formula for a substance that is composed of 40.66% carbon, 8.53% Hydrogen,23.72% Nitrogen, and 27.09% Oxyg
prohojiy [21]

Answer:

THE EMPIRICAL FORMULA OF THE SUBSTANCE IS C2H5NO

Explanation:

The steps involved in calculating the empirical formula of this substance in shown in the table below:

Element                            Carbon           Hydrogen          Nitrogen         Oxygen

1. % Composition              40.66              8.53                 23.72                27.09

2. Mole ratio =

%mass/ atomic mass       40.66/12         8.53/1          23.72/14            27.09/16

                                       =  3.3883            8.53              1,6943             1.6931

3. Divide by smallest

value (0.6931)          3.3883/1.6931    8.53/1.6931    1.6943/1.6931   1.6931/1.6931

                               =      2.001                  5.038           1.0007                      1

4. Whole number ratio        2                       5                   1                               1

The empirical formula = C2H5NO

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3 years ago
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How many moles of KNO3 are in 500 mL of 2. 0 M KNO3? mol KNO3.
8090 [49]

The moles can be defined as the mass of the substance with respect to molar mass. The moles of potassium nitrate is 1 mol.

<h3>How to calculate moles of a substance?</h3>

The moles of a compound can be calculated from:

\rm Moles=\dfrac{Mass}{Molar\;mass}

The molarity can be defined as the moles of solute in a liter of solution.

The molarity can be expressed as:

\rm Molarity=\dfrac{Moles\;\times\;1000}{Volume\;(mL)}

The molarity of potassium nitrate solution is 2 M, and the volume is 500 mL.

The moles of potassium nitrate is given as:

\rm 2\;M=\dfrac{Moles\;\times\;1000}{500\;mL}\\ Moles=\dfrac{2\;\times\;500}{1000}\;mol\\ Moles=1\;mol

The moles of potassium nitrate in 2 M, 500 mL solution are 1 mol.

Learn more about moles, here:

brainly.com/question/15209553

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Explanation:

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Why do Christians call Jesus "the Christ”? Christ comes from the Greek word for Messiah. Christ comes from the Greek word for sa
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Answer:

D

Explanation:

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