Answer:
+8 J/mol
Explanation:
The following were obtained from the question:
Mole of the compound = 3 moles
Heat Energy used = 24J
Hreaction =?
The heat of reaction is the energy released or absorb during a chemical reaction. It is can obtained mathematically by the following equation:
Hreaction = Heat energy/mole
With the above equation, we can easily find the Hreaction for the question given as follow:
Hreaction = Heat energy/mole
Hreaction = 24J / 3mol
Hreaction = 8 J/mol
Since the compound used the energy, the Hreaction is +8 J/mol
Nitrogen and hydrogen atoms that make up ammonia (NH3) are held together by polar covalent bonds, where electrons are shared unequally. Nitrogen is significantly more electronegative than hydrogen, so shared electrons spend more of their time orbiting the nitrogen atom.
Answer:
B&C
Explanation:
Atoms combine in whole number ratios to form compounds.
and
Atoms cannot be created or destroyed during a chemical reaction.
The correct answer is B. The atomic radius decreases across a period but increases down a group. The periodic table is arranged in order to predict certain properties of the elements across a period or down a group. Aside from the atomic radius, other trends include electron affinity, ionization energy, electronegativity and metallic character.