In the quantum-mechanical model of the atom, which of the following is NOT one of the four quantum numbers needed to specify the probable location of an electron?
A. Principal quantum number (n) which describes the energy level/distance from the nucleus
B. Heisenberg number (H) which describes the electron's position and momentum.
C. Angular quantum number (1) which describes the shape of an electron's orbital
D. Magnetic quantum number (ml) which describes the orbitals orientation in space

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

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every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

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