Answer to Question #335363 in General Chemistry for mmmlar

Question

How many moles of carbon are in 2.5g of ethanol? 

Answer 1

n(C₂H₅OH) = m(C₂H₅OH) / Mr(C₂H₅OH)

n(C₂H₅OH) = 2.5 g / 46.07 g/mol = 0.05 moles

1 mol of C₂H₅OH contains 2 mol of atomic carbon

n(C) = 2n(C₂H₅OH)

n(C) = 2 * 0.05 moles = 0.1 moles