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NNADVOKAT [17]
3 years ago
14

If 5.3g O2 reacts with NH3 to produce 3.1g NO2, what would the percent yield of NO2 be?. . 4NH3(g) + 7O2(g) --> 4NO2 + 6H2O(g

)
Chemistry
2 answers:
Nesterboy [21]3 years ago
3 0
Molar mass

O2 = 16 x 2 = 32.0 g/mol        NO2 = 14 + 16 x 2 = 46.0 g/mol

<span>4 NH3 + 7 O2 = 4 NO2 + 6 H2O

7 x 32.0 g O2 -----------> 4 x 46.0 g NO2
5.3 g O2 -----------------> ( mass NO2)

mass NO2 = 5.3 x 4 x 46.0 / 7 x 32.0

mass NO2 = 975.2 / 224

= 4.3535 g of NO2

4.3535 g NO2 ----------- 100 %
3.1 g NO2 --------------- ( percent yield )

percent yield = 3.1 x 100 / 4.3535

percent yield = 310 / 4.3535

= 71.20%

hope this helps!




</span><span>
</span>
Alex17521 [72]3 years ago
3 0
Given equation is : <span>4 NH3 + 7 O2 = 4 NO2 + 6 H2O
</span>where 
5.3 g of 02 react with NH3 to produce 3.1 g NO2
To calculate % yield of NO2
First Find the Molar mass of O2 and NO2 as following

O2 = 16 x 2 = 32.0 g/mol        NO2 = 14 + 16 x 2 = 46.0 g/mol

<span>from equation above , we know that 7 oxygen molecules react to produce 2 molecules of NO2

7 x 32.0 g O2 -----------> 4 x 46.0 g NO2
5.3 g O2 +NH3 -----------------> ( mass NO2)

mass NO2 = 5.3 x 4 x 46.0 / 7 x 32.0

mass NO2 = 975.2 / 224

= 4.3535 g of NO2

4.3535 g NO2 ----------- 100 %
3.1 g NO2 --------------- ( percent yield )
Percent yield of NO2 can be calcuated by :

percent yield of NO2 = 3.1 x 100 / 4.3535

percent yield = 310 / 4.3535

Percent yield of NO2= 71.20%</span>
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Morgarella [4.7K]

Mass of hydrate + crucible = 47.29 g

Mass of anhydrous salt = 2.7 g

Molar mass of anhydrous salt CuSO4 = 159.5 g

Given,

mass of empty crucible = 42.45 g

mass of hydrate salt= 4.84 g

mass of crucible after first heating = 46.1 g

mass of crucible after second heating= 45.153 g

mass of crucible after third heating= 45.15 g

so, as per the question we need to find...

Mass of hydrate + crucible = ? g

Mass of anhydrous salt = ? g

Molar mass of anhydrous salt CuSO4 = ? g

∴Mass of hydrate + crucible = 42.45 + 4.48 = 47.29 g

The given salt is in hydrate form, to remove water from this molecule we need to perform heating .

So we are taking the substance into the crucible as it is in less quantity.

Here, we performed heating 3 times and note the weight after every heating.

After this, assume that the water is totally evaporated and the remaining salt is in anhydrous form,

∴ Mass of anhydrous salt = 45.15 - 42.45 = 2.7 g

To find the molar mass of anhydrous salt of CuSO4,

atomic weight of Cu = 63.5 g

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