el mercurio es un objeto metalico muy pesado en aleaseones con otro metales como oro y plata se conose cono amalgama q fenoneno es
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Ответ:
Answer : The percentage mass of excess with respect to initial mass is 60.0 %
Solution : Given,
Mass of
= 40 g
Mass of
= 25 g
Molar mass of
= 64 g/mole
Molar mass of
= 32 g/mole
First we have to calculate the moles of
and 
.
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 2 mole of
react with 1 mole of 
So, 0.625 moles of
react with 
moles of 
From this we conclude that,
is an excess reagent because the given moles are greater than the required moles and 
is a limiting reagent and it limits the formation of product.
Now we have to calculate the excess moles of
Excess moles of
= Required moles - Given moles
Excess moles of
= 0.781 - 0.312 = 0.469 mole
Now we have to calculate the excess mass of
Excess mass of
= 15.0 g
Initial mass of
= 25 g
Now we have to calculate the percentage mass of excess with respect to initial mass.
Therefore, the percentage mass of excess with respect to initial mass is 60.0 %