A rigid container of O2 has a pressure of 2551 mmHg at a temperature of 713 K. What is the pressure at 273 K?

Iknow the answer is a but i don't know why

Astudent made the lewis dot diagram of a compound shown. what is the error in the lewis dot diagram? a)an o atom should transfer all of its six electrons to mg because the formula is mgo b) both electrons of mg should be transferred to one o adam because the formula is mgo c) the electrons should be transferred from each o add him to capital mg because mg has fewer electrons d) the number of dots around mg should be four because it has to transfer two electrons to each o

One does not belong why? ice, gold ,wood ,diamond and table salt