Most scientists agree that all of today's continents were part of a single continent known as Pangaea around 250 million years ago. The map below shows the theorized positions of some of these continents at that time. Which of the following would best provide evidence to support the theory that Pangaea existed in Earth's past? A. A scientist finds a Cynognathus fossil close to a Mesosaurus fossil in Africa. B. A scientist finds a large number of Mesosaurus fossils spread across South America. C. A scientist finds Lystrosaurus fossils in India, Africa, and Antarctica. D. A scientist finds a Glossopteris fossil in the ocean off the coast of India.

true

hope that

i believe it is 40–40–20%

explanation:

16

explanation:

the marks go by 4s

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