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CBSE Class 11-science Answered

1.0g of magnesium is burnt with 0.56g of oxygen in a closed vessel. Which reactant is left in excess and how much?

Asked by Diyakrishnakrupa8 | 15 May, 2019, 07:37: PM
Expert Answer
Given:
 
Mass of Mg = 1 gm
 
Mass of oxygen = 0.56 gm
 
Moles of Mg
 
   equals space 1 over 24
equals space 0.041 space mol
 
 
Moles of Oxygen = 
 
equals space fraction numerator 0.56 over denominator 32 end fraction

equals space 0.0175 space mol
 
 
The reaction is,
 
 
space Mg space space space space space space plus space space space space space bevelled 1 half straight O subscript 2 space space space space space space space rightwards arrow space space space space MgO
space space 1 space mol space space space space space space space space space space space space space 0.5 mol space space space space space space space space space space space space space space 1 space mol

0.041 space mol space space space space space space space space 0.0175 space mol space space space space space space space space apostrophe straight x apostrophe space mol

So space according space to space stoichiometry space of space reaction comma

0.041 space moles space of space Mg space will space reaquire space 0.0205 space mole space space of space oxygen

Therefore space straight O subscript 2 space is space straight a space limiting space agent.

here space 0.0175 space moles space of space oxygen space is space given comma

So space it space will space react space with

0.0175 cross times 2 space equals space 0.035 space moles space of space Mg

Hence space excess space of space Mg space equals space 0.041 minus space 0.035 space

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 0.0066 space mol space of space Mg

1 space mole space of space Mg space equals space 24 space gm

0.0066 space mole space equals space 24 cross times 0.0066

space space space space space space space space space space space space space space space space space space space equals space 0.1584 space gm space of space Mg

space space space space space space space space space space space space space space space space space space space space almost equal to space 0.16 space gm
 
Therefore, oxygen is limiting reagent, magnesium is left in excess and it is 0.16 gm.
Answered by Varsha | 16 May, 2019, 11:07: AM
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