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Yes. In fact, it's often necessary to avoid assigning coefficients larger than 1 to products. For example, in the same rxn you gave, the other way to balance it is: 2H2 + O2 --> 2H20. However, this now multiplies the products (H20) by 2. Since reaction enthalpies given next to Hess's law rxns are the change in enthalpy per exactly 1 mole of product, adding a coefficient to that product would then change the rxn (and therefore the enthalpy) to producing twice as much product. Using fractions as coefficients elsewhere is the best way to avoid this problem.
In hess's law, we are calculating the overall enthalpy change. Because enthalpy is a state function, we know it isnt pathway dependent. Therefore, it doesn't matter which way it got there. If you have fractions, as long as you changed enthalpy along with it its fine :)
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