Un tanque de aire de un buceador contiene 30 litros (Volumen) de aire a 20°C (Temperatura) y 15 atm (presión).
Calcular el volumen del aire en condiciones normales. (Condiciones
normales de P y T = temperatura de 0°C (o 273,15 K, trabajaremos 273
K) y a una presión de 1 atm.

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