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Vlada [557]
3 years ago
11

How many grams of NH3 are needed to provide the same number of molecules as in 0.55 grams of SF6?

Chemistry
1 answer:
xenn [34]3 years ago
4 0
Above it says the molecular weights are

NH3- 17g/mol and SF6-146 g/mol

Well 1 mole of SF6 is 146.048 grams (i added hte atomic masses of each element). So then the number of moles in 0.85 grams would be 0.00582000438 moles.


<span><span>= 1mole / 146.048g *</span> 0.85g</span>


so we would need 0.00582000438 moles of NH3 to have the same number of molecules.

One mole of NH3 is 17.030519999989988 grams (i added each atoms mass). so 0.00582000438 moles of NH3 would be:


<span><span>= 17.030519999989988 g / mole * </span>0.00582000438moles</span>


that equals 0.09911770099 grams.

so 0.09911770099 grams is the answer if you rounded, you get about 0.1 grams



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3.- First we need to write the complete equation of the reaction and balanced it.

Then, we need to convert the mass given to moles of each compound.

After that, we need used rule of three calculate the amount of products based on the moles of reactants given.

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35 g of Mg reacted with excess O2

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Actual yield = ?

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Equation  

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                      35g                  ------------------  x

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Theoretical yield = 58 g of MgO

Actual yield = percent yield x theoretical yield / 100

                    = 90 x 58 / 100

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