Final answer:
The correct number of unique mole ratios that can be obtained from the given chemical equation P4O10 + 6H2O → 4H3PO4 is 15, as each substance can have a unique mole ratio with every other substance in the equation.
Step-by-step explanation:
To determine how many mole ratios can be correctly obtained from a chemical equation, you look at all of the possible unique ratios between the reactants and the products. In the equation provided, P4O10 + 6H2O → 4H3PO4, there are six substances involved, which allows for multiple ratios to be formed.
However, the unique mole ratios are determined by comparing each substance with every other substance one time. So, for the first substance, there will be five unique ratios (with the other 5 substances), for the second substance there will be four unique new ratios (ignoring the ratio already counted with the first substance), and so on, until the last substance, which doesn't require any new ratios as all would have been counted already. This results in a total of 5 + 4 + 3 + 2 + 1 = 15 unique mole ratios.
However, the question lists options only up to 6. Since the question seems to be incorrect in providing potential answers, we can't choose from the given options. The correct answer is that there are 15 unique mole ratios that can be obtained from the provided chemical equation.