Two vectors which do not lie along the same line represent what kind of
motion?
O
A. One-dimensional motion
OB. Scalar motion
O
C. Resultant motion
O
D. Two-dimensional motion

the answer is b. dilution

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

d : a person who learns about the world by observing it. no that is not a smiley face

explanation: