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vfiekz [6]
3 years ago
9

PLZ HELP - WILL MARK BRAINLIEST *

Chemistry
1 answer:
vovikov84 [41]3 years ago
7 0

Answer:The final pressure i.e the pressure of the compressed gas is 273.8mmHg

Explanation:i think

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The refining of aluminum from bauxite ore (which contains 50.% Al2O3 by mass) proceeds by the overall reaction 2Al2O3 + 3C → 4Al
iragen [17]

Answer:

18.9 x 10¹³ grams of Bauxite Ore

Explanation:

Al₂O₃ = 50% of Bauxite Ore

Al₂O₃ = 0.5 (Bauxite Ore)--------------------------------------- (1)

Overall reaction:

2Al₂O₃ + 3C → 4Al + 3CO₂--------------------------------------- (2)

[ Al= 27 , O=16, C=12]

From  (2), 2 moles of  Aluminium oxide (Al₂O₃) gives  4 moles of Aluminium

In terms of grams, we can say:

Al₂O₃ = [2(27) +3(16)]

         = 54 +48

         =102grams

2 moles of Al₂O₃ = 2 x102grams

                            =204grams

4 moles of Al = 4 x 27

                      =108 grams

So from (2):

204 grams of  Al₂O₃   = 108 grams of  Aluminium

x grams of  Al₂O₃        =  5.0 x 10¹³grams of Aluminium

Calculating for x:

x =  (204 x  5.0 x 10¹³)/ 108

  = 9.44 x 10¹³ grams

So 9.44 x 10¹³ grams of pure bauxite (Bauxite) is required.

However the to calculate the quantity of raw bauxite, we use (1):

Bauxite ore = Pure Bauxite/0.5

                   =   9.44 x 10¹³ grams/0.5

                   =   18.88 x 10¹³ grams

                    ≈ 18.9 x 10¹³ grams

 

8 0
3 years ago
The metal atoms in iron are held together by what
Gwar [14]
They held together by metallic bonds.


Hopefully this has helped! :)
3 0
3 years ago
Air, Sea water, alloy afe the examples of
ratelena [41]

Answer:

B. Mixture

because air,sea water and alloy are example of Mixture

8 0
3 years ago
An ideal gas has a volume of 14.5 L in a flexible balloon at 680.0 mmHg at
irina1246 [14]

Answer:a

Explanation:yes

6 0
3 years ago
Why are significant figures rules for calculations more important in science than in math class?
inysia [295]

Answer:

The importance of significant figures

As stated before, it is important within the science fields that you are not more precise or accurate than the least accurate or precise number. In science, it is generally agreed upon that the last number digit in any figure is filled with uncertainty.

Explanation:

4 0
3 years ago
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