Rocks are made of minerals, and they are formed in different ways.


According to the diagram above, how are sedimentary rocks formed?

A.

Wastes deposited by plants and animals decompose and weather.

B.

Sand and other particles are buried, compacted, and cemented together.

C.

Molten rock cools and turns solid.

D.

Other rocks experience intense heat and pressure.

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

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