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3 years ago

The atomic mass of helium-4 is 4.0026 amu. How many of each

Chemistry

1 answer:

umka21 [38]3 years ago

7 0

Answer:

Protons: 2.

Electrons: 2.

Neutrons: 2.

Explanation:

Hello,

In this case, since an atom's atomic number is equal to the number of electrons, considering the electron configurations, taking into account that helium-4 is neither positively nor negatively charged, we can infer that the number of electrons equal the number of protons, which in this case are 2, due to the fact that is atomic number is 2.

Moreover, as helium-4's atomic number is 4 as a whole number, we compute the number of neutrons by using the shown below equation:

$Neutrons=mass\ number-atomic\ number\\\\Neutrons=4-2\\\\Neutrons=2$

Regards.

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What is the molarity of a solution which has a volume of 3 litres and contains 5.1 moles of Br2?

katrin [286]

Answer:

The molarity of the solution is 1.7 $\frac{moles}{liter}$ .

Explanation:

Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

$Molarity=\frac{moles of solute}{volume of the solute}$

Molarity is expressed in units $\frac{moles}{liter}$ .

In this case, you know:

moles of solute= 5.1
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Replacing:

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The reaction is:

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This means that 1 mol of NH4 (NO3)s produces 3 moles of gases.

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