Step-by-step explanation:
Ethanol = C2H5OH
Molar mass = 46.07 g/mol
(the periodic table is helpful here)
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After that,
46.07 g C2H5OH ------- 1 mole C2H5OH
0.485 g C2H5OH ------- X
X = 0.485 g C2H5OH x 1 mole C2H5OH/46.07 g C2H5OH
X = 0.011 moles
Answer: 0.011 moles of C2H5OH