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3 years ago

How many atoms of each element are in this chemical formula?

Chemistry

2 answers:

BartSMP [9]3 years ago

7 0

Answer:

B. 2 nitrogen, 4 hydrogen, and 3 oxygen

xxMikexx [17]3 years ago

3 0

Answer:

c. 5 nitrogen, 1 hydrogen, and 1 oxygen

Explanation:

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Suppose that you take 200 mg of an antibiotic every 8 hr. The half-life of the drug is 8 hr (the time it takes for half of the

DochEvi [55]

Answer:

600 mg

Explanation:

The initial amount of the drug = 200 mg

The half-life of the drug = 8 hrs

It means that:-

After 6 hours, the concentration becomes :- $\frac{200}{2}$ mg

After 12 hours, the concentration becomes :- $\frac{200}{4}$ mg

After 18 hours, the concentration becomes :- $\frac{200}{8}$ mg

And so on...

Thus,

After infinite time = $200+\frac{200}{2}+\frac{200}{4}+\frac{200}{8}+..$

Thus,

After infinite time = $200\times (1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+..)$

The sum of the infinite series is:- $1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+..$ = $\frac{1}{1+\frac{1}{2}}=2$

So,

<u>After infinite time = $200\times 2$ mg = 600 mg</u>

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3 years ago

Iron-56, Iron-54, and Iron-58 are all ____ of iron

JulijaS [17]

Answer:

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Different fabrics rub together, and electrons may rub off

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Define:

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Answer:

Atom is a the smallest particle of a chemical element that can exist.

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A particle can be a single atom or a molecule ( a group of atoms held together by chemical bonds).

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