Question

1 g of magnesium is burnt with o.56 g O2 in a closed vessel . which reagent left in excess and how much

Answer 1

1 g of Mg is burnt with 0.56g O2 in a closed vessel. Which reagent is left in excess and how much?

First of all write a balance Rxn

2Mg +o2 →→2 Mgo

Now 2 moles of mg react with 1 mole of oxygen

32 gm oxygen react with 48 gm of mg

Apply unitary method

32 gm o2 …….reacts with 48 gm mg

1gm of o2 will react ……..48／32

So,0.56 gm o2 will react ……..48×0.56/32

=0.84 gm magnesium .

This is the amount of mg that have been consume or react with oxygen …..so ,left amount

1–0.84=0.16

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