Question

The total negative charge on the electrons in 1mol of helium (atomic number 2, molar mass 4) is ________?

Answer 1

Answer:

$1.92\times 10^5 C$

Explanation:

We are given that

Atomic number=2

We have to find the total negative charge on the electrons in one mole of Helium.

We know that atomic number=Proton number

Proton number=Number of electrons=2

Number of electrons in Helium=2

1 mole of Helium=$6.02\times 10^{23}$ atoms

We know that q=ne

Where n =Number of fundamental units

e=Charge on electron

1 e=$1.6\times 10^{-19}C$

Using the formula

$q=2\times 1.6\times 10^{-19}=3.2\times 10^{-19}C$

Total negative charge in 1 mole=$3.2\times 10^{-19}\times 6.02\times 10^{23}=1.92\times 10^5C$

Hence, the total negative charge on the electrons in 1 mole of Helium=$1.92\times 10^5 C$

Answer 2

The total negative charge on the electrons in 1 mol of helium is 2e⁻

The negative charge in 1 mole of a substance (here; it is helium atom) is equal to 6.022  10²³ atoms and it is also equal to 96485 C/mol

In 1 mole of helium containing 2 atomic numbers and a molar mass of 4.

The total negative charge on the electrons for 1 mole of helium can be computed as:

$\mathbf{\implies 1 \ mol \ of \ He \times \Big(\dfrac{2 \ mol \ e^- }{1 \ mol } \times ( 96485 \ C/mol) \Big)}$

= 192970 C

Recall that:

The negative charge in 1 mole of helium = 96485 C/mol

∴

Numbers of negative charge in 192970 C of helium is:

= (192970/ 96485)

= 2e⁻

Learn more about atomic numbers here:

https://brainly.com/question/17274608?referrer=searchResults