Question

N a solution we have 2 mol of substance a. 2 mol of substance b, and 7 mol of substance c. find the mole fraction of substance c?

Answer 1

Question :

In a solution,we have 2 moles of substance A,2 moles of substance B and 7 moles of substance C. Find the Mole Fraction of substance C

Answer :

Mole Fraction of substance C is 0.63

There are,

• 2 moles of substance A

• 2 moles of substance B

• 7 moles of substance C

We have to find the Mole Fraction of substance C

Firstly,we would need to calculate the number of moles of solution.

No.of Moles of Solution = 2 + 2 + 7

No.of Moles of Solution = 11

Mole Fraction is given as :

$\sf \: Mole \ Fraction = \dfrac{X_{component}}{X_{solution}}$

Now,

$\sf \: Mole \ Fraction = \dfrac{ X_C}{X_{solution}} \\ \\ \longrightarrow \: \sf \: Mole \ Fraction = \dfrac{7}{11} \\ \\ \longrightarrow \: \boxed{ \boxed{ \sf Mole \ Fraction = 0.63}}$

Answer 2

$\huge\sf{Answer:}$

☆ Given:

⇏ In a solution we have 2 mol of substance A, 2 mol of substance B and 7 mol of substance V.

☆ Find:

⇏ Find the mole fraction of substance C.

☆ According to the question:

⇏ 2 moles = A

⇏ 2 moles = B.

⇏ 7 moles = C.

☆ We know that:

⇏ $\sf Mole \: fraction = \dfrac{X_ Component}{X_Solution}$

⇏ $\sf Mole \: fraction = \dfrac{2 + 2 + 7}{11}$

⇏ $\sf Mole \: fraction = \dfrac{7}{11}$

⇏ ${\sf{\underline{\boxed{\sf{Mole\: fraction = 0.63}}}}}$

Therefore, 0.63 is the mole fraction of substance C.

☆ ADDITIONAL EXPLANATION:

⇏ According to the question we must find the mole fraction for substance C so to find the mole fraction we must add the other moles of substance A, B. So,

$\sf \dfrac{Total\: number \:of \:moles}{X_solution\: (Mole\: 7\: of \:substance \:C)}$

We get our answer, ${\sf{\underline{\boxed{\sf {\dfrac{7}{11}= 0.63}}}}}$