Given that no reaction occurred when the test solution was added to the supernatant after 3 mL of 0.1 M CuSO, was mixed with 3 mL of 0.1 M NaS, what can be inferred about the stoichiometry? The molar ratio of CuSO to NaS is 2:1 for the reaction The molar ratio of CuSO4 to NaS is 1:1 for the reaction. Nothing can be inferred about the stoichiometry for the reaction. The molar ratio of CuSO to NaS is 1:2 for the reaction. 4