Chemistry College

What should the coefficient for the diatomic oxygen (O2) be when this equation is correctly balanced

Answers

Answer 1

And then for Fe it should be 4 and for the products it should be 2!!

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HELPP

There are 9.23 x 1023 molecules of water in a beaker, how many moles are there?

Answers

Answer:

Answer: There are 1.53 moles present in molecules of water in a beaker.

Explanation:

According to the mole concept, there are molecules present in 1 mole of a substance.

So, number of moles present in molecules are calculated as follows.

Thus, we can conclude that there are 1.53 moles present in molecules of water in a beaker.

Explanation:

In the reaction represented by the equation: N2 + 3H2 → 2NH3, what is the conversion factor of nitrogen to ammonia? Explain by using law of definite proportion

Answers

Answer:

10/3

Explanation:

Hope this helps

Answer:

The compound formula for the ammonia is

. It is a colorless gas. It is the result of the chemical reaction between nitrogen and hydrogen gas. The chemical reaction between the gases is shown below:

→

The human body contains many elements from the periodic table. It is mostly composed of oxygen and carbon, but trace
elements also have a significant role. The table gives the mass, in kilograms, of some elements found in the human body, based
on a 70.0 kg person.
Atomic number
Element
Mass (kg)
8
oxygen
45.2
6
carbon
12.6
1
hydrogen
7.0
7
nitrogen
2.2
20
calcium
1.3
15
phosphorus
0.78
19
potassium
0.25
16
sulfur
0.18
others
0.60
total
70,0
Potassium makes up what fraction of the mass of the human body?

Answers

Potassium makes up 1/280 of the mass of the body.

From the question given above, the following data were obtained:

Oxygen = 45.2 Kg

Carbon = 12.6 Kg

Hydrogen = 7 Kg

Nitrogen = 2 Kg

Calcium = 1.3 Kg

Phosphorus = 0.78 Kg

Potassium = 0.25 Kg

Sulphur = 0.18 Kg

Others = 0.60 Kg

Total = 70 Kg

Fraction of potassium =?

We can obtain the fraction of potassium of the mass of the body as follow:

Potassium = 0.25 Kg

Total = 70 Kg

Fraction of potassium =?

Fraction of potassium = mass of potassium / Total

Fraction of potassium = 0.25 / 70

Fraction of potassium = 1/280

Therefore, the fraction of potassium in the body is 1/280

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