Cell phone jammers work by interfering with the signals exchanged between cell phones and nearby cell phone towers. As a result, cell phones being affected by cell phone jammers do not receive communication signals from nearby towers.

How do cell phone jammers disable the communication between cell phones and nearby cell phone towers?
A.
Cell phone jammers change the frequency of the signals emitted by cell phones and cell phone towers.
B.
Cell phone jammers transmit powerful signals at the same frequency as the signals used by cell phones and cell phone towers.
C.
Cell phone jammers absorb signals that are emitted by cell phone towers before they reach cell phones in the area.
D.
Cell phone jammers reflect the signals emitted from cell phone towers away from cell phones in the area.

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c) should be the answer.

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