Ile moli stanowi 38g wody

m(wody) = 2*m(H) + m(O) = 2 + 16 = 18g 18g = 1 mol H2O 36g : 18g = 2 mole 36g - 2 mole 38g - x x = 38 * 2 : 36 = 2,1 mola Odp. 36g H2O to 2,1 mola :).

Odp. M H2O=2*1[g/mol]+16[g/mol]=18[g/mol]; 1[mol] H2O - 18[g]; x[moli] H2O - 38[g]; x=2,1[mola] H2O.

M H2O=2*1 + 16 = 18g/mol 1molH2O-18g/mol x-38g/mol x=2,11molH2O