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Asked Dec 5, 2019
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-2
Sio Si Fa
4
mg 7g
9.
12:17 AM Thu Dec 5
Done
Done
AA
e www-awu.ale s.com
O STOICHIOMETRY
Limiting reactants
Jaquesha
Gaseous ethane (CH,CH,) will react with gaseous oxygen (02) to produce gaseous carbon dioxide (CO2) and gaseous water (H,0). Suppose 21. g of
ethane is mixed with 157.g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer
has the correct number of significant digits.
x10
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-2 Sio Si Fa 4 mg 7g 9. 12:17 AM Thu Dec 5 Done Done AA e www-awu.ale s.com O STOICHIOMETRY Limiting reactants Jaquesha Gaseous ethane (CH,CH,) will react with gaseous oxygen (02) to produce gaseous carbon dioxide (CO2) and gaseous water (H,0). Suppose 21. g of ethane is mixed with 157.g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits. x10

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Expert Answer

Step 1

Given,

Mass of ethane, (CH3CH3) C2H6 = 21 g

Mass of oxygen, O2 = 157 g

Moles of C2H6 and O2 can be calculated as:

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Molar mass of C2H6 = (2×12) + (6×1) = 30 g/mol 21 g Mass Moles of C2H6 = 0.7 mol 30 g/mol Molar mass Molar mass of O2 = (2×16) = 32 g/mol 157 g Mass Moles of O2 4.90625 mol 32 g/mol Molar mass

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Step 2

The balanced chemical reaction of gaseous ethane with oxygen to produce gaseous carbon dioxide and gaseous water can be written as:

2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g)

Stoichiometric molar ratio of C2H6 : O2 = 2 : 7 = 1 : 3.5

Actual molar ratio of C2H6 : O2 = 0.7 : 4.90625 = 1 : 7

Therefore, O2 is present in excess and C2H6 is the limiting reagent. Therefore, moles of CO2 produced will depend on C2H6.

From the given reaction, it is evident that : 

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2 mol C2H6 produces 4 mol CO2 4 mol CO2 .. 0.7 mol C2H6 produces x 0.7 mol of C2H6 2 mol C2H6 = 1.4 mol CO2

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Step 3

Mass of CO2 can be calcu...

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Molar mass of CO2 = 12 + (2×16) = 44 g/mol Mass of CO2 = Moles x Molar mass Mass of CO2 = 1.4 mol × 44 g/mol Mass of CO2 = 61.6 g

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