Question

calculate the mass of 50 molecules are of water​

Answer 1

Answer:

It's easy to find the molecular mass of a compound with these steps: Determine the molecular formula of the molecule. Use the periodic table to determine the atomic mass of each element in the molecule. Multiply each element's atomic mass by the number of atoms of that element in the molecule

As water contains 50% D2O, this means that it contains 1/2 mol co. of H2O and 1/2 mole of D2O. Mass of 1/2 mole of D2O = 1/2 × (2 × 2 + 16) = 10 g