Iwill mark brainliest if the number of crests that pass a point in a given time increases, what has decreased? question options: intensity wavelength frequency amplitude as taylor swift stood knee-deep in the ocean, she noted how high the waves came up on her compared to the day before. which property of waves was taylor observing? question options: amplitude speed frequency wavelength

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