Which of these layers inside earth is the hottest? a. crust b. outer core c. lower mantle d. asthenosphere

Explanation:

In chemistry, the mole fraction or molar fraction is defined as unit of the amount of a constituent, nᵢ divided by the total amount of all constituents in a mixture, nₜₒₜ:This expression is given below:-

{\displaystyle x_{i}={\frac {n_{i}}{n_{\mathrm {tot} {\displaystyle x_{i}={\frac {n_{i}}{n_{\mathrm {tot}

The sum of all the mole fractions is equal to 1:

{\displaystyle \sum _{i=1}^{N}n_{i}=n_{\mathrm {tot} };\;\sum _{i=1}^{N}x_{i}=1}{\displaystyle \sum _{i=1}^{N}n_{i}=n_{\mathrm {tot} };\;\sum _{i=1}^{N}x_{i}=1}

The same concept expressed with a denominator of 100 is the mole percent, molar percentage or molar proportion (mol%).

The mole fraction is also called the amount fraction.[1] It is identical to the number fraction, which is defined as the number of molecules of a constituent Ni divided by the total number of all molecules Ntot. The mole fraction is sometimes denoted by the lowercase Greek letter χ (chi) instead of a Roman x.[2][3] For mixtures of gases, IUPAC recommends the letter y.[1]