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mash [69]
3 years ago
15

A what is matter that is always composed of the same combination of atoms

Chemistry
1 answer:
Bingel [31]3 years ago
7 0

Answer:

A substance

Explanation:

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In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many moles of hydrogen gas will be produced from 75.0 milliliters of
Zanzabum
HCl is <span>limiting reactant, Mg in excess therefore:

</span><span>number of moles HCl:

75.0 mL in liters: 75.0 / 1000 => 0.075 L

Molarity HCl = 1.0 M

n = M x V

n = 1.0 x 0.075 

n = 0.075 moles of HCl

</span>Mg(s) + 2 HCl (aq) = H2 (g) + MgCl2 (aq)

<span>2 moles HCl  -------------------- 1 mole H2
</span><span>0.075 moles of HCl ------------ ( moles H2)
</span>
moles H2 = 0.075 x 1 / 2

moles H2 = 0.075 / 2

= 0.0375 moles of H2

hope this helps!

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8 0
3 years ago
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melamori03 [73]

Answer:

<h3>homeostasis</h3>

•the maintenance of a stable internal environment

<u><em>Hope </em><em>this</em><em> helps</em><em> </em><em>:</em><em>)</em></u>

6 0
3 years ago
New evidence can lead to a change in scientific knowledge. (20 points) True False
GuDViN [60]
The answer to this question would be True.
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The industrial revolution contributed to the pollution we have today
Sergio [31]
I think the answer might be false. I hope this helps!
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4 years ago
How many moles are in 5.4x1024 molecules of C4H2F7I, heptafluoro-1-iodobutane? Group of answer choices
jasenka [17]

Given :

Number of molecules of C_4H_2F_7I.

To Find :

How many moles are in given number of molecules.

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We know, in 1 moles of any element/compound contains 6.022\times 10^{23} at atoms/molecules.

So, number of moles in 5.4\times 10^{24} molecules are :

n = \dfrac{5.4\times 10^{24}}{6.022\times 10^{23}}\\\\n = 8.97 \ moles

Therefore, number of moles are 8.97 .

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3 years ago
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