Which of the following reactions is endothermic? C (diamond) + O 2(g) → CO 2, ΔH = -94.50 kcal
H 2(g) + ½O 2(g) → H 2O(g), ΔH = -57.82 kcal
½N 2(g) + 3/2H 2(g) → NH 3(g) + 11.0 kcal
½N 2(g) + O 2(g) + 8.1 kcal → NO 2(g)

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.

the answer is 0.8m.

by: nicholas

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