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Yusra Makkeh: Attempt 1
Question 1 (1 point)
A 4.24 kg chandelier hangs from the ceiling of a large ballroom. If the chandelier is
8.81 m above the floor, what is its gravitational potential energy relative to the floor.
(record a 3 digit answer in the space provided)
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About 366 joules

Explanation:

PEg = mgh

PEg = 4.24(8.81) * 9.81

PEg = 37.3544 * 9.81

PEg = 366.446664, which rounds to 366 joules.

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