# chemistry (urgent)

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Commercial breathalyzers contain .75 mg of K2Cr2O7, 1.5 mL of H20 and 1.5 mL of H2SO4. What is the concentraion of the dichromate in the solution?(hint:the acid is a solvent)

• chemistry (urgent) -

Concn in what units?
moles/L??
0.75 mg = 0.00075 g and moles = grams/molar mass.
Then M = moles/L soln and th volume is 3.0 mL or 0.003 L.
If you want it in mg/L. it is 0.75 mg/0.003 L = ??

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