NGC 1232 is a spiral galaxy about twice the size of our Milky Way Galaxy. It is located about 100 million light-years from Earth. Which of the following best explains why the physical properties of these two galaxies are similar? A. The temperatures of the stars within each galaxy are all identical
B. The two galaxies have the same shape and both orbit the same star
C. The two galaxies formed from the same materials and in the same way
D. All of the stars making up each galaxy are the same age and their life cycles as the sun

c, liquids evaporate, creating a gas

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