Chemistry Lab

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I need help with the third part

The chemical method of analysis in determination of the blood alcohol content (%BAC) is:

K2Cr2O7 + H2SO4 + C2H5OH → Cr2(SO4)3 + K2SO4 + CH3COOH + H2O

What are the stoichiometric coefficients for the reaction above? (please enter the coefficients without spaces and with a coma between the numbers, e.g. 1,2,3,4)

2,8,3,2,2,3,11

During a Breathalyzer Test it was determined that 1.30mg of K2Cr2O7 was consumed by the above reaction. Calculate the number of milligrams of ethanol in the test sample.

0.305

Calculate the Blood Alcohol Content in this sample (%BAC).

Someone told me I need to know the volume of the sample but I am not given that info

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