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swat32
2 years ago
9

Solve the 3 questions

Chemistry
1 answer:
Dmitrij [34]2 years ago
5 0

Answer:

what kind of math is this

Explanation:

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When a 3.80 g sample of magnesium nitride (MW 101g/mol) is reacted with 3.30 g of water, 3.60 g of MgO is formed. What is the pe
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  The  percent   yield  of  this   reaction  is  calculated  as  follows
  Mg3N2  +  3H2O  =2NH3  +  3Mgo

  calculate  the   theoretical  yield,
moles=mass/molar  mass
moles Mg3N2=  3.82  g/100g/mol=  0.0382  moles(limiting  regent)

moles of  H2o=  7.73g/18g/mol  = 0.429  moles ( in  excess_)

by  use   of  mole  ratio   between  Mg3N2  to  MgO  which  is  1:3   the    moles  of MgO =  0.0382  x3  = 0.1146  moles
mass =moles  x molar  mass

the  theoretical  mass  is therefore =  0.1146mole  x  40  g/mol  =  4.58 grams

The %  yield  =  actual  mass/theoretical  mass  x1000

=  3.60/4.584  x100=  78.5%
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