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TEA [102]
3 years ago
8

Which of these is an element?

Chemistry
2 answers:
Drupady [299]3 years ago
8 0
Carbon I hope you are right :3
gulaghasi [49]3 years ago
3 0

Answer;

Carbon

Explanation;

-An element or a chemical element refers to a substance that cannot be broken down by chemical means. Elements are  pure substances and consists of one type of atom.

-Each atom of an element has an atomic number, which represents the number of protons in the nucleus of the atom of that element.

-In this case, the only element in the above choices is carbon. Carbon is an element in the periodic table with an atomic number of 6.

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Calculate the mass-to-mass ratio of 25.0 g of salt in 105 g of water. Work must be shown in order to earn credit.
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Answer:

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Explanation:

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3 years ago
(C6H6) can be biodegraded by microorganism. if 30 mg of benzene is present, what amount of oxygen required for biodegradation, n
quester [9]

Answer:

36.92 mg of oxygen required for bio-degradation.

Explanation:

5C_6H_6+15O_2\rightarrow 12CO_2+15H_2O

Mass of benzene = 30 mg = 0.03 g (1000 mg = 1 g )

Moles benzene =\frac{0.03 g}{78 g/mol}=0.0003846 mol

According to reaction 5 moles of benzene reacts with 15 moles of oxygen gas.

Then 0.0003846 mol of benzene will react with:

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Mass of 0.0011538 moles of oxygen gas:

0.0011538 mol × 32 g/mol = 0.03692 g = 36.92 mg

36.92 mg of oxygen required for bio-degradation.

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