Need help on this. Only if you know please.

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

Provide a stepwise curved arrow mechanism that fully explains the outcome of the reaction shown below. oh нао* heat он

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)