Question

compare 1 mole of hydrogen with 1 mole of oxygen. they will have: select the correct answer below: the same number of atoms and the same masses. a different number of atoms and the same masses. the same number of atoms and different masses. a different number of atoms and different masses.

Explanation:

Step1: Recall Avogadro's number

1 mole of any substance contains Avogadro's number ($6.022\times 10^{23}$) of particles (atoms, molecules etc.). So 1 mole of hydrogen and 1 mole of oxygen have the same number of atoms.

Step2: Consider molar - mass

The molar mass of hydrogen ($H$) is approximately 1 g/mol, and the molar mass of oxygen ($O$) is approximately 16 g/mol. So 1 mole of hydrogen and 1 mole of oxygen have different masses.

Answer:

The same number of atoms and different masses.