US 11. A baseball in motion is acted upon by four directional forces as shown.
4+
2
What must be true of the forces for the baseball to continue to move in the same direction with the same
speed?
A Force 1 is greater than force 3.
ning
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B. Force 2 is greater than force 4.
C. Forces 1, 2, 3, and 4 are balanced.
D. Forces 1, 2, 3, and 4 are unbalanced.

oh it is true if thats what you are asking

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