Among the groups of elements listed below, which have the same number of electrons in their outermost energy levels? C, K, Ca, R
2 answers:
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The question is incomplete, here is the complete question:
By titration, 15.0 mL of 0.1008 M sodium hydroxide is needed to neutralize a 0.2053-g sample of an organic acid. What is the molar mass of the acid if it is monoprotic.
<u>Answer:</u> The molar mass of monoprotic acid is 135.96 g/mol
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:
- <u>For sodium hydroxide:</u>
Molarity of NaOH solution = 0.1008 M
Volume of solution = 15.0 mL
Putting values in above equation, we get:
As, the acid is monoprotic, it contains 1 hydrogen ion
1 mole of ion of NaOH neutralizes 1 mole of
ion of monoprotic acid
So, 0.00151 moles of ion of NaOH will neutralize
of
ion of monoprotic acid
<u>In monoprotic acid:</u>
1 mole of ion is released by 1 mole of monoprotic acid
So, 0.00151 moles of ion will be released by
of monoprotic acid
To calculate the number of moles, we use the equation:
Moles of monoprotic acid = 0.00151 mole
Given mass of monoprotic acid = 0.2053 g
Putting values in above equation, we get:
Hence, the molar mass of monoprotic acid is 135.96 g/mol