A 350.0 mL flask is filled with 0.580 g of an unknown gas. It is found that when that gas is at a temperature of 30.0 ℃, that the pressure is 442 mmHg. Which of the following could be the gas?
(a) hydrogen
(b) fluorine
(c) chlorine
(d) bromine
(e) nitrogen
(f) oxygen
(g) neon
(h) none of these
(i) more info needed

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answer seismograph;

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