Molar mass of a mixture of two solids

I wonder, if I wanted to know the molar mass of a some white crystalline solid that is a mix of $\ce{C6H12O6}$ and $\ce{C12H22O11}$, would I just do this :

$$170.1559 \; \ce{g/mol} + 343.2965 \;\ce{g/mol} = 522.4524 \; \ce{g} / 2 \ce{mol}$$

Thus : $261,2262 \; \ce{g/mol}$.

Would this be a correct operation ? Or it wouldn't make any physical sense ? Thank you!

• Does the crystalline contain fifty percent of each? Feb 27 '15 at 21:00
• Glucose + sucrose? The idea of an averaged molecular mass seems pointless to me. Feb 27 '15 at 21:13