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Answer :
Using the molar mass of 4-aminophenol, we can calculate that a 1.57 g sample of this compound contains 14.4 mmol.
To calculate the number of moles (n) in the sample (m = 1.57 g), we have to use the molar mass (M) of 4-aminophenol. We can calculate the molar mass of the compound using its molecular formula - C₆H₇NO
We use the relative atomic masses for each element present in the compound (12 for carbon, 1 for hydrogen, 14 for nitrogen, and 16 for oxygen):
M = (6 * 12 + 7 * 1 + 14 + 16) g/mol
M = 109 g/mol
We can now calculate the number of moles in the sample:
n = m/M
n = 1.57 g / 109 g/mol
n = 0.0144 mol
n = 14.4 mmol
You can learn more about molar mass here:
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