Calculate the concentration in mol dm⁻³ of a solution of phosphoric acid if 50cm³ of the solution is neutralised by 80cm³ of 0.15 mol dm⁻³ sodium hydroxide solution.

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

1. list three scientific reasons cockroaches may fly.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.