Question

TreeAzin, an insecticide treatment for Emerald Ash Borer contains 5% by mass of Azadirachtin C35H44O16. how many mg of carbon (from chemical) dose a larvae ingest by eating 0.0134 oz of cambium tree tissue?

Answer 1

mass of tree tissue = 0.0134oz = 0.0134*28349.5mg = 379.8833mg

Of this 5% by mass is Azadirachtin ( C₃₅H₄₄O₁₆) = 5/100*379.8833 = 0.05*379.8833 = 18.994mg

Now molecular weight of  C₃₅H₄₄O₁₆ = 720.72g/gmol

Moles of  C₃₅H₄₄O₁₆ =  18.994mg/ 720.72g/gmol = 0.0264millimoles

In one mole of  C₃₅H₄₄O₁₆ there are 35 moles of C

In 0.0264mmoles of C₃₅H₄₄O₁₆ there are 0.0264mmoles*35 = 0.924mmoles

I mol of C = 12g

0.924mmoles = 0.924*12 = 11.088mg

The amount of carbon ingested = 11.088mg