Answered

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A solution of an unknown compound has a concentration of 11.7 % by mass. Howmany moles are present in 2.780 kg of solution if the solute has a molar mass of118.5 g/mol?

Sagot :

We are required to calculate the number of moles.

Given:

concentration = 11.7%

molar mass = 118.5 g/mol

mass = 2.780 kg = 2780 g

To calculate the number of moles we can use the following equation:

[tex]n\text{ =}\frac{m}{M}[/tex]

Where m is the mass and M is the molar mass of the unknown solution.

n = 2780 g /118.5 g/mol

n = 23.46 moles

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