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aleksklad [387]
3 years ago
10

HELP PLZ !!!!! !!!!

Chemistry
1 answer:
bezimeni [28]3 years ago
7 0

Answer:

D

Explanation:

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Use the reaction:
damaskus [11]
The answer is 34.2 mL
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2 years ago
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What would make a conversion not possible?
MAVERICK [17]

if it is already as low as it can go

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3 years ago
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14.7 grams of magnesium reacts completely with 9.7 grams of oxygen to form magnesium oxide (MgO). What is the percent compositio
swat32
The answer is 60.3% magnesium, 39.7% oxygen.
Solution:
The chemical equation for the reaction is 2 Mg + O2 → 2 MgO.
Since magnesium reacts completely with oxygen, it is the limiting reactant in the reaction. Hence, we can use the number of moles of magnesium to get the mass of MgO produced:
     moles of magnesium = 14.7g / 24.305g mol-1
                                       = 0.6048 mol

     mass of MgO = 0.6048mol Mg(2 mol MgO/2mol Mg)(40.3044g MgO/1 mol MgO) 
                           = 24.376g MgO

We can now solve for the percentage of magnesium:
     % Mg = (14.7g Mg / 24.376g MgO)*100% = 60.3%

We also use the number of moles of magnesium to get the mass of oxygen consumed in the reaction:
     mass of O2 =  0.6048 mol Mg (1mol O2 / 2mol Mg) (31.998g / 1mol O2) 
                        = 9.676g

The percentage of oxygen is therefore
     % O2 = (9.676g O2 / 24.376g MgO)*100%
               = 39.7%
Notice that we can just subtract the magnesium's percentage from 100% to get 
     % O2 = 100% - 60.3% = 39.7%
5 0
3 years ago
20)
anyanavicka [17]

Answer:

D

Explanation:

7 0
3 years ago
Who hypothesized that electrons orbit around a nucleus? Bohr Greek philosophers Thomson Dalton
makvit [3.9K]

The answer to this question is bohr Greek


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