Dónde se emplean las ecuaciones químicas? ?

Los números en frente de las fórmulas se llaman coeficientes estequiométricos. Estos deben ser tales que la ecuación química esté equilibrada, es decir, el número de átomos de cada elemento de los reactivos y de los productos de la reacción sea el mismo.

*¡Espero que esto ayude! Marcame mas inteligente :)

level 4 to level 2 : ))

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