Question The melting point of paradichlorobenzene is 53.0°C. In a laboratory activity, two students try to verify this value. The first student records 51.5°C, 53.5°C, 55.0°C, 52.3°C, and 54.2°C. The second student records 52.3°C, 53.2°C, 54.0°C, 52.5°C, and 53.5°C. a. Calculate the average value for the two students.

b. Calculate the percent error for each student.

c. Which student is most precise? Most accurate? Explain.

b. th3 n4zc4 pl4t3 15 c0nv3rg1ng w1th the s0uth 4m3ric4n pl4t3.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

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