Question

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1 g Mg is burnt in a closed vessel which contains 0.5 g oxygen (a) Which reactant is in excess, (b) Weight of excess reactant, (c) Calculate the weight of Mgo formed? ​

Answer 1

Answer:

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Explanation:

Correct option is

A

O

2

is a limiting reagent and Mg is in excess by 0.25 g

Balanced reaction is:

2Mg+O

2

→2MgO

According to the reaction 2 mol (or 2×24.3=48.6g) Mg reacts with 32 g oxygen. 1 g of Mg requires =

48.6

32

=0.66g oxygen but given oxygen is 0.5 g ∴ oxygen is the limiting reagent

0.5 g oxygen can burn ==

32

48.6

×0.5=0.75g Mg

Excess of Mg left =1−0.75=0.25g

Answer 2

Answer:

b is the answer

Explanation:

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