2. The year graphs shown below represent hours of daylight and solar energy for what location? Hours of daylight
January 1
24
20
16
JAN FEB MAR APR MAY NAG SER OCT NOV DEC
500
400
Solar energy
(W/m2)
300
200
100
0
AN FERM
APR MAY JUN AUG SEP OCT NOV 060
O A North Pole (90° N)
O B. Arctic Circle (66.5°N)
O C. Tropic of Cancer (23.5°N)
O D. Equator (0)

c. is the answer

by love gaming

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