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belka [17]
3 years ago
10

The atomic number of this element is 9 and its mass is 20. how many neutrons does this element have?

Chemistry
2 answers:
devlian [24]3 years ago
8 0

Answer:

11 neutrons

Explanation:

Mass no. = 20

atomic no. = 9

no. of neutrons = mass number - atomic number

                          =   20 - 9

                          =     11 neutrons

Marta_Voda [28]3 years ago
3 0
Hey there!

n = A - Z

n = 20 - 9

n = 11
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The chemical equation below shows the formation of aluminum oxide (Al2O3) from aluminum (Al) and oxygen (O2).
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Answer:

Mass = 182.4 g

Explanation:

Given data:

Number of moles of Al₂O₃ = 3.80 mol

Mass of oxygen required = ?

Solution:

Chemical equation:

4Al + 3O₂    →       2Al₂O₃

Now we will compare the moles of aluminum oxide and oxygen.

                Al₂O₃           :           O₂

                   2               :            3

                 3.80            :         3/2×3.80 = 5.7

Mass of oxygen:

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4 0
2 years ago
Based on the illustration below, explain how the different organ systems work together.
Stella [2.4K]

Answer:

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8 0
3 years ago
HELP ASAP PLEASE!!!
sveticcg [70]
1. Pure substances cannot be separated into any other kinds of matter, while a mixture is a combination of two or more pure substances.

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3 years ago
Alum is a compound used in a variety of applications including cosmetics, water purification, and as a food additive. It can be
mylen [45]

yield = 52.23 %

Explanation:

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mass of aluminium = mass of bottle with aluminium pieces - bottle mass

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mass of alum = mass of bottle with final product - bottle mass

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To calculate the theoretical quantity of alum that should be obtained from 0.03694 moles of aluminium we devise the following reasoning:

if       2 moles of aluminium produce 2 moles of alum

then 0.03694 moles of aluminium produce X moles of alum

X = (0.03694 × 2) / 2 = 0.03694 moles of alum (theoretical)

yield = (practical quantity / theoretical quantity) × 100

yield = (0.01929 /  0.03694) × 100

yield = 52.23 %

Learn more about:

reaction yield

brainly.com/question/7786567

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5 0
3 years ago
Why does determining volume work only for a regular shaped object
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Answer:

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