Question

Using the reaction: Mg + O2 --> Mgo,

What is the balanced equation?
If you start with 2g Mg, how many grams of
02 do you need for this reaction to go to
completion?

Answer 1

2Mg +O2 -----》 2MgO

the balanced equation

if you start with 2g of Mg let's calculate moles

one mole of mg id 24.30 g

so number of moles =0.08

hence 2 moles of Mg reacts with 1 mole of O2 molecule

so Moles of O2 molecule is 0.04

and mass of O2 in gm is = 16 ×0.04

which is equal to 0.64 gm

so the conclusion is if you start with 2g Mg, you need 0.64 grams of

O2 molecules for this reaction to go to

completion!!

i d k it's right or wrong but i tried my best :)