How many moles of Mg would you need to react with 2.5 moles of O2?

2mg+o2--->2mgo

2moles of mg react with one mole of o2 to form 2 moles of mgo

given 2.5moles of o2 hence 5moles of mg will react

c.the charges if the proton and electron and gravity

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.