How can molarity and osmolarity be calculated from mass per unit volume?

Answer 1

Osmolarity is the quantity of osmoles in a liter of solution; molarity is the quantity of solute in moles per liter of solution.

Assume you have a solution with 1.00 L of solution and 40.0 g of NaCl in it.

ACTIVITY

The quantity of solute in a solution expressed in moles per liter is known as its molarity.

#M = n/V#

The mass of NaCl must be converted to moles of NaCl.

Moles of NaCl = 40.0 g NaCl × #(1 mol NaCl)/(58.44 g NaCl)# = 0.684 mol NaCl
#M = n/V = (0.684 mol)/(1.00 L)# = 0.684 mol/L

OMOLLARITY

When an ionic compound dissolves, it separates into cations and anions, like NaCl.

Cl⁻(aq) + NaCl(s) → Na⁺(aq)

Since osmosis is dependent on the number of solute particles in a solution, 1 mol of NaCl yields 2 mol of osmotic particles. The osmotic pressure is determined by the number of moles of both Na+ and Cl-.

An osmole is a mole of solute that adds to the osmotic pressure in a solution.

The molarity of the compound multiplied by the quantity of particles generated by one mole of the compound is the osmolarity.

The NaCl solution's osmolarity is

#(0.684 mol)/(1 L) × (2 Osmol)/(1 mol)# = 1.37 Osmol/L
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Answer 2

Molarity (M) is calculated by dividing the number of moles of solute by the volume of the solution in liters. Osmolarity is calculated similarly, considering the total number of particles (ions or molecules) formed by the solute in the solution.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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