Given the balanced equation representing a reaction at 101.3 kpa and 298 k:
n2(g) + 3h2(g) => 2nh3(g) + 91.8 kj
which statement is true about this reaction?
(1) it is exothermic and dh equals -91.8 kj.
(2) it is exothermic and dh equals +91.8 kj.
(3) it is endothermic and dh equals -91.8 kj.
(4) it is endothermic and dh equals +91.8 kj.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2

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