Question

6 Which of the following terms are unitless?
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Answer 1

The term morality is uniteless

Answer 2

Answer:

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Explanation:

Answer: (iii) Mole fraction

(iv) Mass percent

Explanation:

1. Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Molarity=\frac{n}{V_s}Molarity=

V

s

n

where,

n= moles of solute

V_sV

s

= volume of solution in L

Molarity=moles/LMolarity=moles/L

2. Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

Molarity=\frac{n}{W_s}Molarity=

W

s

n

where,

n = moles of solute

W_sW

s

= weight of solvent in kg

Molality=moles/kgMolality=moles/kg

3. Mole fraction is the ratio of moles of one component to the total number of moles.

x_{A}=\frac{\text {moles of A}}{\text {moles of A+moles of B}}x

A

=

moles of A+moles of B

moles of A

Thus has no units.

4. Mass percent is the ratio of mass of one component to the total mass.

To calculate the mass percent of element in a given compound, we use the formula:

\text{Mass percent}=\frac{\text{Mass}}{\text{Total mass}}\times 100Mass percent=

Total mass

Mass

×100