The standard heat of formation of liquid trichloroethylene is -276.2 kJ/mol. (a) Use the given data and tabulated standard heats of formation of ethylene and HCl to calculate the standard heat of formation of tetrachloroethane and the standard heat of reaction for the second reaction. (b) Use Hess’s law to calculate the standard heat of reaction for: 2H4 () + 2�

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yes

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Power braking's benefits

Among the big advantages of a power braking system are it's: Regarded as safer. The heat caused by the friction of drum brakes causes them to wear down. Because disc brake systems have better heat distribution, they're more efficient

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All this is to say that new technologies develop quickly and continuously, and society is used to and adapts quickly to these constant innovations. ... Medical technology is always improving, leading to lower infant mortality, cures for diseases, and many more improvements in quality of life.

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