Question

find the mole 3 moles of A and 7 moles of B​

Answer 1

Answer:

please correct your question

Answer 2

mole fraction of a/b = (moles of a/b) divided by (moles of a + moles of b)

Xa = Na/(Na+Nb)

= 3/(3+7)

= 3/10

= 0.3

Xb = Na/(Na+Nb)

= 7/(3+7)

= 7/10

= 0.7

alternatively

Xa+Xb+..........Xn = 1

Xa = 1 - 0.7

= 0.3

or

Xb = 1-0.3

= 0.7

:-)