Answer to Question #125153 in General Chemistry for mike

Question #125153

What mass of magnesium oxide is formed by reacting 1.20g of magnesium in excess oxygen?
2Mg(s) + O2(g) ⇨ 2MgO(s)

Expert's answer

Balance reaction

"2Mg + O2\\implies2MgO"

Moles "1.2\/24" excess 0

at t =0

At t =t 0 excess 1.2/24

Hence moles of MgO will formed according to unitary method is 1/20 moles

mass of MgO formed = 1/20 * 40

= 2 gm.

Here Mg is limiting reagent.

Mole concept will be applied according to limiting reagent.

Limiting reagent is that reagent which ends first.

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Comments

Assignment Expert

15.07.20, 13:52

Dear Mike, Questions in this section are answered for free. We can't fulfill them all and there is no guarantee of answering certain question but we are doing our best. And if answer is published it means it was attentively checked by experts. You can try it yourself by publishing your question. Although if you have serious assignment that requires large amount of work and hence cannot be done for free you can submit it as assignment and our experts will surely assist you.

mike

10.07.20, 15:38

how did u got 1.2/24 excess0

mike

10.07.20, 15:36

I couldn't understand this solution can someone explain it to me please?