Answer to Question #139602 in Organic Chemistry for jjj

Question

An aqueous solution has 18% of solute. By chemical analysis, it was known that it has 10 mol% solute.
What is the molecular weight of the solute?

Answer 1

m = n*M, m - weight, n - quantity of substance, M - molecular weight

m_x /18 = m_H2O / 82

n_x = n_H2O / 9

n_x *M_x = n_H2O * M_H2O*18/82

M_x = M_H2O*18*9/82 = 18*18*9/82=35.56