Answer:
½N 2(g) + O 2(g) + 8.1 kcal → NO 2(g)
½N 2(g) + ½O 2(g) → NO(g), ΔH = +21.6 kcal/mole
NH 3(g) → ½N 2(g) + 3/2H 2(g), ΔH = +11.0 kcal/mole
General Formulas and Concepts:
<u>Thermochemistry</u>
- Endothermic vs Exothermic
- Enthalpy
Explanation:
An endothermic reaction would have heat or energy gained in the final stage of the reaction.
This means that our enthalpy would be positive and heat/energy would be added as a reactant.
Out of all the answer choices, we see that only these have heat/energy added in the reactant side or the enthalpy being positive:
½N 2(g) + O 2(g) + 8.1 kcal → NO 2(g)
½N 2(g) + ½O 2(g) → NO(g), ΔH = +21.6 kcal/mole
NH 3(g) → ½N 2(g) + 3/2H 2(g), ΔH = +11.0 kcal/mole
Topic: AP Chemistry
Unit: Thermochemistry
Answer:
metalloid can not show shielding effect but elements can show
Answer: 15.7 g CO2
Explanation: Solution attached:
CaCO3 => CaO + CO2
Convert mass of CaCO3 to moles.
Use the mole ratio of CaCO3 and CO2 from the balanced equation.
Convert moles of CO2 to mass using its molar mass.
Answer:
Vena Cava
Explanation:
The Vena Cava tells is where blood coming from the body transports through the vein of the Vena cava