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mash [69]
3 years ago
6

Which type of engineering design uses an already-existing design?

Engineering
2 answers:
Vaselesa [24]3 years ago
8 0

Answer:

c

Explanation:

Arte-miy333 [17]3 years ago
4 0
The answer is D I’m 90% sure
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Write down the equation for the stoichiometric combustion of ethane (C2H6) with oxygen, and determine the stoichiometric air fue
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Answer:

Equation:

\text{C}_{2} \text{H}_{6} + \dfrac{7}{2}\text{O}_{2} \rightarrow 2\text{CO}_{2} + 3\text{H}_{2}\text{O}

Supose we have 1 kmol of ethane, according to the equation we should have 7/2 kmol of oxygen, witch corresponds to a number of mols of air of:

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\text{N}_{air} = 15,0 \text{kmol} [\tex]As molar weight of ethane is [tex]\dfrac{M_{air}}{M_{ethane}} = \dfrac{N_{air}\cdot MW_{air}}{N_{ethane}\cdot MW_{etane}} = \dfrac{15kmol\cdot 28.9kg/kmol}{1kmol\cdot 30kg/kmol}=14.45 and air is 0.233*32 + 0.767*28 = 28.9kg/kmol, the mass ratio is:

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