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expeople1 [14]
3 years ago
11

Which material is very strong and tough but shows very little elongation as it absorbs energy?

Chemistry
1 answer:
natita [175]3 years ago
7 0
Kevlar would be the answer!! enjoy the rest of your day broskies!!!
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Propane (c3h8) is burned in oxygen to produce carbon dioxide and water. the heat of combustion of propane is -2012 kj/mole. how
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C_{3} H_{8} + 5 O_{2} ---\ \textgreater \  3CO_{2}  +4H_{2}O    (-2012 \frac{kJ}{mol} )


3 mol                10 mol


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because 3 mol propane require 15 mol oxygen (by reaction)

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10 mol oxygen ---2 mol propane

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so 

2012 ( kJ/mol)*2 mol =4024 KJ heat will be given off

Correct answer is number 4.



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