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2 years ago

There are three isotopes of X element (X):

Chemistry

1 answer:

Nutka1998 [239]2 years ago

8 0

Answer:

Average atomic mass = 17.5 amu.

Explanation:

Given data:

X-17 isotope = atomic mass17.2 amu, abundance:78.99%

X-18isotope = atomic mass 18.1 amu, abundance 10.00%

X-19isotope = atomic mass:19.1 amu, abundance: 11.01%

Average atomic mass of X = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass = (78.99×17.2)+(10.00×18.1) +(11.01+ 19.1) /100

Average atomic mass = 1358.628 + 181 +210.291 / 100

Average atomic mass = 1749.919 / 100

Average atomic mass = 17.5 amu.

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3 years ago

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Answer:

A) 4P + 5O₂ → 2P₂O₅

Explanation:

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This equation is not balanced. There are two phosphorus, two oxygen atoms on left and two phosphorus five oxygen on right side of equation.

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3 years ago

Why is a Container important to the sustainability of your hydroponic system?

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2 years ago

Cars run on gasoline, where octane (C8H18) is the principle component. This combustion reaction is responsible for generating en

Bezzdna [24]

Answer:

10.19 g CO₂

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Explanation:

The combustion reaction of Octane is:

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1 gallon = 3.785 L

1 L = 1000 mL

Now we convert 1.24 gallons to mL:

1.24 gallon * $\frac{3.785L}{1gallon} *\frac{1000mL}{1L} =$ 4693.4 mL

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4693.4 mL * 0.703 g/mL = 3.30 g Octane

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3 years ago

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netineya [11]

Answer:

223.6539

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3 years ago