Question

In a laboratory setting, concentrations for solutions are measured in molarity, which is the number of moles per liter (mol/L). Concentrations are often converted to more common units on the labels of household products. For a particular brand of bleach, the concentration of sodium hypochlorite (NaClO) is reported on the bottle as 7.25% by mass. The following information can thus be used to calculate the molarity of NaClO in the bleach:

• 1L of bleach has a mass of 1,100 grams.

• 7.25% of the mass of bleach is NaClO.

• 1 mol of NaClO has a mass of 74.44 grams.

What is the molarity (mol/L) of NaClO in the bleach?

A.0.097
B.0.93
C.1.07
D.79.75

Answer 1

Answer:

its C

Explanation:

1/74.44 * 79.75 = 1.07

Answer 2

The molarity (mol/L) of NaClO in the bleach, given the data is 1.07 mol/L (Option C)

What is molarity?

Molarity is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:

Molarity = mole / Volume

How to determine the mass of NaClO in the bleach

• Mass of bleach = 1100 g
• Percentage of NaClO = 7.25%
• Mass of NaClO = ?

Mass of solute = percent × mass of solution

Mass of NaClO = 7.25% × 1100

Mass of NaClO = 0.0725 × 1100

Mass of NaClO = 79.75 g

How to determine the mole of NaClO

• Mass of NaClO = 79.75 g
• Molar mass of NaClO = 74.44 g/mole
• Mole of NaClO =?

Mole = mass / molar mass

Mole of NaClO = 79.75 / 74.44

Mole of NaClO = 1.07 mole

How to determine the molarity

• Mole of NaClO = 1.07 mole
• Volume = 1 L
• Molarity of NaClO =?

Molarity = mole / Volume

Molarity of NaClO = 1.07 / 1

Molarity of NaClO = 1.07 mol/L

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