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The molecular weight of H2 and the mass of 1 mole of H2 are quantaties. The mass of 1 mole of H2 is 2.01588g while the molecular weight of H2 is also 2.01599g. This means they are both the same amount of H2.

Answer: a. same quantities

Explanation: According to avogadro's law, 1 mole of every substance contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.  

Molecular weight of [tex]H_2[/tex] = 2.0 g/mol

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]

[tex]\text{Number of moles}=\frac{2g}{2g/mol}=1 mole[/tex]

Now 1 mole of [tex]H_2[/tex] molecule contains = [tex]6.023\times 10^{23}[/tex] of molecules.

Thus both represent same quantities.

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