Breathalyzer lab titration problem

[magikalcb]

Given:

1) 2K₂Cr₂O₇ + 8H₂SO₄+3C₂H₅OH --->2Cr₂(SO₄)₃+2K₂SO₄+
3 CH₃COOH + 11 H₂O

2) K₂Cr₂O₇ + 6 KI + 7 H₂SO₄ ---> Cr₂(SO₄)₃ + 4 K₂SO₄ + 3 I₂ +7H₂O

3) I₂ + 2 Na₂S₂O₃ ---> 2 NaI + Na₂S₄O₆

10mL of 0.0025 M K₂Cr₂O₇
Initial Volume of .0010M Na₂S₂₀₃ was 25mL.
Final volume of .0010M Na₂S₂₀₃ was 12.39mL

.0010M Na₂S₂₀₃

How many moles of Na₂S₂O₃ reacted in reaction 3.
How many moles of K₂Cr₂O₇ that reacted with the ethanol in reaction 1[/code]