7. Radon-222 has a half-life of 3.8 days. Starting with 50 g of radon-222, how much would be left after 19 days? Show your Work.

Which of the following statements is false regarding aromaticity? a. the compound must be cyclic b. the compound must be fully conjugated c. the compound must be planar d. the number of electrons in the pi system must satisfy the hückel 4n+2 rule e. the compound must have a neutral charge

Matches the chemical name of each oxide of phosphorus to its chemical formula

Express the following number in scientific notation. 0.026890 =