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sleet_krkn [62]
3 years ago
14

In 4/2HE, what does the number 4 indicate?

Chemistry
1 answer:
11Alexandr11 [23.1K]3 years ago
6 0

The number 4 in the 4/2He indicates the atomic mass number of helium.

Answer: Option 3

<u>Explanation: </u>

The elements present in periodic table generally represented as X_{Z}^{A}. Here X will be the element in the periodic table, A is the atomic mass number of the element X and Z is the atomic number of the element X.

So, the number 4 is the atomic mass number of He and He-4 is the stable isotope of helium which can also be termed as alpha particle.

               Mass number = number of protons + neutrons count.

Thus the number 4 denotes the Helium's atomic mass number.

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1.1214 mL will a 0.205-mole sample of He occupy at 3.00 atm and 200 K.

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The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Using equation PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

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a certain piece of copper wire is determined to have a mass of 2.0 0g per meter how many centimeters of the wire would be needed
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The given question tells you that a certain piece of wire has a mass  = 2.0 g per meter

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