The mass of benzoic acid is 0.244 g.
Here use the concept of molarity.
The amount of a substance in a specific volume of solution is known as its molarity (M). The moles of a solute per liter of a solution is known as molarity.
Molarity = no. of moles/volume (in L)
Given,
Molarity, M = 0.100 M
Volume, V = 20.00 mL = 20.0 × 10⁻³
To calculate,
Mass of benzoic acid C₇H₆O₂ =?
We know that,
Molecular mass of benzoic acid, C₇H₆O₂ = 122
No. of moles = weight/ molecular mass
The formula is modified as,
Molarity = weight of cholesterol/ (molecular mass) (Volume)
Put the values in the formula,
0.100 = Mass of benzoic acid/ (122) (20 × 10⁻³)
Mass of benzoic acid = 0.100 (122)(20 × 10⁻³)
= 244 × 10⁻³
= 0.244 g
Hence, the mass of benzoic acid is 0.244 g.
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