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horsena [70]
2 years ago
13

Someone please do this!!!

Chemistry
1 answer:
Lilit [14]2 years ago
4 0

Answer:

1) Fe = 69.9%

O = 31.1%

2) H = 5.19%

O = 16.5%

N = 28.9%

C = 49.5%

Explanation:

One easy way to do percent compositions is to assume you have 100g of a substance.

1) Lets say we have 100g of Fe2O3.

The total molar mass would be:

= 55.845*2+15.999*3 = 159.687

The molar mass of the Fe2 alone is:

=55.845*2 = 111.69

Thus, the grams of Fe2(out of a 100) could be calculated by multiplying 100g * the molar mass ratio of Fe2 to the whole:

= 100g *\frac{111.69}{159.687} = 69.9431

Which is approximately 69.9%.

We can find the amount of O3 by simply subtracting, as the rest of the compound is made of O3. Thus, the % composition of O3 is 31.1%

You can then do this same process to the next question, getting us the following:

H = 5.19%

O = 16.5%

N = 28.9%

C = 49.5%

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hammer [34]

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3 years ago
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crimeas [40]

Answer:

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Explanation:

Organism can be simply classified on the basis of the cellularity of the organism. Two main types of organism are unicellular organisms and the multi cellular organisms.

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Thus, the correct answer is option (d).

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2 years ago
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SVETLANKA909090 [29]

The net force = -5 N

The direction : to the left(negative sign)

<h3>Further explanation </h3>

Net force : the sum of all forces acting on an object

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The direction of the force (horizontal motion) is to the right (+32 N), and to the left (-37 N), so the net force :

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If this helped mark Brainliest!
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Hello..................<br><br>.....​
VashaNatasha [74]

Hello.....

Have a beautiful and joyful day ahead.

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