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lions [1.4K]
3 years ago
8

What happens to the influenza virus every 20-40 years, and why? What are the recent example(s)?

Chemistry
1 answer:
LenKa [72]3 years ago
8 0

Answer:

The influenza virus is mutated every 20-40 years.

Explanation:

Large mutations occur every 20-40 years. This results in a new influenza virus to  which the human population has no protection. These large mutations are almost always followed by an influenza pandemic.

Hope this helps!

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How many moles are in 9.25E24 formulas units of sodium acetate?
Lelu [443]

Answer:

<h2>15.37 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{9.25 \times  {10}^{24} }{6.02 \times  {10}^{23} }  \\  = 15.365448...

We have the final answer as

<h3>15.37 moles</h3>

Hope this helps you

5 0
3 years ago
Please answer for me ☺️
levacccp [35]
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4 0
3 years ago
Each type of mineral has a chemical composition that is what
denis23 [38]

Each type of mineral has a chemical composition that is unique such as its chemical composition and the arrangement of atoms. For example, the mineral hematite is Fe2O3. There are two atoms of iron (Fe) and three atoms of oxygen (O).

8 0
3 years ago
Can u pls answer 22, 23, 24
natulia [17]

Answer:

22 - b, 23- A, 24- a

Explanation:

6 0
2 years ago
Fuel-cell cars use hydrogen gas and release ______ into the atmosphere.
iogann1982 [59]
Hi!

Fuel-cell cars only release water and heat in the atmosphere. 

Since they are only run by oxygen and hydrogen to produce electricity in the motor, they don't emit carbon dioxide or greenhouse gas as what other people think. 

Basically, automotive engineers and scientist classified them as zero-emission.  
7 0
3 years ago
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