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andreyandreev [35.5K]
3 years ago
11

A mole is the amount of a substance that contains as many particles as the number of atoms in 12 grams of what isotope?

Chemistry
1 answer:
ioda3 years ago
3 0
The <span>12C</span><span> isotope.  Hope this helps.</span>
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Which chemical formula represents both an element and a molecule?
victus00 [196]

Answer:

Explanation:

element - a basic substance that can't be simplified (hydrogen, oxygen, gold, etc...) molecule - two or more atoms that are chemically joined together (H2, O2, H2O, C6H12O6, etc...) compound - a substance that contains more than one element (H2O, C6H12O6, etc...)

5 0
2 years ago
Which of the following could be true of two species that have a competitve ralationship in the same ecosystems Help me out pleas
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The answer is b. as a whole, the species is mutually beneficial to carry on each others traits and exist in the same ecosystem.
6 0
3 years ago
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Balance the equation<br> N2O5 + H2 -&gt; NH3 + H2O
Lubov Fominskaja [6]

Answer:

I hope this is it. I'm not really sure.

4 0
2 years ago
Which of the following expressions is the correct equilibrium-constant expression for the equilibrium between dinitrogen tetroxi
nekit [7.7K]

Answer:

D. [NO₂]²/[N₂O₄]

Explanation:

The equilibrium constant expression for a reaction is products over reactants. Since NO₂ has a coefficient of 2, it will become an exponent.

So, it would be:

[NO₂]²/[N₂O₄]

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3 0
2 years ago
How do I calculate the molecular weight of Mg(OH)2?
vodomira [7]

The molecular weight of Mg(OH)2 : 58 g/mol

<h3>Further explanation</h3>

Given

Mg(OH)2 compound

Required

The molecular weight

Solution

Relative atomic mass (Ar) of element : the average atomic mass of its isotopes  

Relative molecular weight (M)  : The sum of the relative atomic mass of Ar  

M AxBy = (x.Ar A + y. Ar B)  

So for Mg(OH)2 :

= Ar Mg + 2 x Ar O + 2 x Ar H

= 24 g/mol + 2 x 16 g/mol + 2 x 1 g/mol

= 24 + 32 + 2

= 58 g/mol

5 0
2 years ago
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