The iodine "clock reaction" involves the following sequence of reactions occurring in a reaction mixture in a single beaker. 1. io3(aq) + 5i–(aq) + 6h+(aq) → 3i2(aq) + 3h2o(l) 2. i2(aq) + 2s2o32–(aq) → 2i–(aq) + s4o62–(aq) the molecular iodine (i2) formed in reaction 1 is immediately used up in reaction 2, so that no iodine accumulates. in one experiment, a student made up a reaction mixture which initially contained 0.0020 mol of iodate ions (io3–). if the iodate ions reacted completely, how many moles of thiosulfate ions (s2o32–) were needed in reaction 2, in order to react completely with the iodine (i2) produced in reaction 1? multiple choice 0.0020 mol 0.012 mol 0.0040 mol

C: 0.012 mol.

Start with 0.0020 moles of iodate ions .

How many moles of iodine will be produced?

converts to in the first reaction. The coefficient in front of is three times the coefficient in front of . In other words, each mole of will produce three moles of . 0.0020 moles of will convert to 0.0060 moles of .

How many moles of thiosulfate ions are required?

reacts with in the second reaction. The coefficient in front of is twice the coefficient in front of . How many moles of does each mole of consume? Two. 0.0060 moles of will be produced. As a result, moles of will be needed.

h let me think

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.