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marysya [2.9K]
3 years ago
11

A compact disc has a diameter of 11.8 cm. What is the surface area of the disk in square centimeters? In square meters?

Chemistry
1 answer:
Leona [35]3 years ago
5 0
A disc is a circle so the formula for the area is pie r^2. So plugging in the numbers bring in the answer of 18.53
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32 gm of O2 to mole of O2
lana [24]

Molar mass of O2:-

\\ \rm\longmapsto 2(16u)=32g/mol

Now

\boxed{\sf No\:of\;moles=\dfrac{Given\:Mass}{Molar\:Mass}}

\\ \rm\longmapsto No\:of\;moles=\dfrac{32}{32}

\\ \rm\longmapsto No\:of\;moles=1mol

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How many moles of HCl are present in 0.70 L of a 0.63 M HCl solution?
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Marshall determines that a gas has a gauge pressure of 276 kpa what's the absolute pressure of the gas
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Murrr4er [49]
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4 0
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A skeleton equation shows just the reactants and products whereas a balanced equation shows the
Anettt [7]

Answer:

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  • <em>A skeleton equation shows just the reactants and products whereas a balanced equation shows the</em><u> relative amounts of, or proportion between, reactants and products.</u>

Explanation:

The <em>skeleton equation</em> shows which <em>reactants </em>are being used and which <em>products </em>are being formed.

The reactants are shown on the left and the products are shown on the right side of the equations, separeted by an arrow.

For example, the skeleton equation to obtain water is:

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From it you know that hydrogen and oxygen react to form water, yet you do not know in which ratio they do it.

Then, you balance the equation, adding the appropiate coefficients, to make the number of atoms of each kind on the reactant side equal to the number of the same kind of atoms on the product side.

This is, for the example of water, the number of hydrogen atoms on  the left must equal the number of atoms of hygrogen on the right side, and  the number of oxygen atoms of the left must equal the number of oxygen atoms on the right.

For the water example that is:

  • 2H₂(g) + O₂(g) → 2H₂O (g)

  • Showing that 2 molecuies of hydrogen (or 4 atoms) react with 1 molecule of oxygen (or 2 atoms) to produce 2 molecules of water, and that proportion (relative amounts) will always be true for that reaction.
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