Sunlight is more spread out as you move away from the equator. True

False - poles

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

i'm pretty sure it is letter c.) car

the answer is option a.

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