Question

What is the mole fraction of water in pure water?
a) 1
b) 2
c) 3
d) 4

Answer 1

Answer:

Option "A" Is correct!

Explanation:

What is mole fraction?

Mole fraction is a unit of concentration, defined to be equal to the number of moles of a component divided by the total number of moles of a solution. Because it is a ratio, mole fraction is a unitless expression. The mole fraction of all components of a solution, when added together, will equal 1.

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Formula of caluculate Mole Fraction:

Mole Fraction Formula. Mole fraction is another way of expressing the concentration of a solution or mixture. It is equal to the moles of one component divided by the total moles in the solution or mixture. Mole fraction is used in a variety of calculations, but most notably for calculating partial pressures.

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Now Come back to your question,

What is mole fraction of water?

First of all,Water is solute so,

The mole fraction of solute is: moles of solute divided by total moles of solute and solvent. The symbol for the mole fraction is the lower-case Greek letter chi, χ. You will often see it with a subscript: χsolute is an example. Example #1: 0.100 mole of NaCl is dissolved into 100.0 grams of pure H2O.

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Your options:

a)1

b)2

c)3

d)4

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So, In this case 1.00 - 0.018 = 0.982.Remember,that all mole fractions the solution should be total up one,

Hence, proved Option A is all Right

Answer 2

the mole fraction of water in pure water is {a}1