If you need to reverse the following reaction in order for it to be an intermediate reaction in Hess's law problem, what would be the final value for the enthalpy of reaction you use for this intermediate reaction? C₂H₄ + 3O₂ ⇒ 2CO₂ + 2H₂O, ΔH= -1410 kJ

A. 2820 kJ
B. -1410 kJ
C. 1410 kJ
D. -2820 kJ

When x = 3 and y = 5, by how much does the value of 3x2 – 2y exceed the value of 2x2 – 3y ?

Need so much on this one how many yards?

Answer this two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: two right triangles abc and edc have a common vertex c. angle abc and edc are right angles. ab is labeled 13 feet, ac is labeled 15 feet, ec is labeled 10 feet, and ed is labeled 4 feet.what is the approximate distance, in feet, between the two poles? 11.14 feet16.65 feet14.35 feet15.59 feet