Question

Calculate the number of moles of carbon atoms in 4.56 grams of ethanol (CH₃CH₂OH).

a.) 2.95 x 10²² mol

b.) 0.0991 mol

c.) 1.19 x 10²³ mol

d.) 2.00 mol

e.) 0.0496 mol

f.) 9.12 mol

g.) 0.198 mol

Answer 1

molar mass of carbon = 12.0107 gm/mol that mean 2 mole of C = 24.0214 gm

molar mass of ethanol = 46.06844 gm/mol that mean 1 mole of ethanol = 46.06844 gm

In 1 mole of ethanol contan 2 mole of carbon that mean 46.06844 gm of ethanol contain 24.0214 gm of carbon

then 4.56 gm of ethanol contain 24.0214 4.56 / 46.06844 = 2.3777 gm of carbon

1 mole of C = 12.0107 gm then 2.3777 gm of carbon = 2.3777 1 / 12.0107 = 0.198 mol

Answer - g.) 0.198 mol