Isooctane
(C8H18)
is a major component of gasoline. a. Using the following thermodynamic data, calculate the change in enthalpy for the combustion of 1.0 mol of isooctane.
H2(g)+1/2O2(g)⟶H2O(g)ΔH0=−241.8kJ C(s)+O2(g)⟶CO2(g)ΔH0=−393.5kJ
8C(s)+9H2(g)⟶C8H18(l)ΔH0=−224.13kJ< br /> . b. One gallon of isooctane has a mass of 2.6 kg. What is the change in enthalpy for the combustion of one gallon of this compound?

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

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one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol