Find the number of moles in 508 g of ethanol (C2H5OH).

To find the number of moles we start by calculating the molar mass:

M (C2H5OH) = 2*M (C) + 6*M (H) + M (O)

M (C2H5OH) = 2 * 12.01 + 6 * 1.008 + 16

M (C2H5OH) = 46.068g

This is mass of one mole of ethanol. Total mass of ethanol can be calculated by using formula:

m = N * M

Where:

m = total mass

N = number of moles

M = molar mass

We rearrange formula for N:

N = m / M

N = 508 / 46.068

N = 11.03

508g of ethanol contains 11.03 moles.