Classification: 2) What is the heat change when 1.48 g of Chlorine reacts with excess phosphorus according to the following equat 2P + 5C12 2PCI5+ 886kJ Classification: 3) What is the heat change when 13.7 g of Nitrogen reacts with excess O2 according to the following equation? N2 + O2 2NO AH° = -180kJ Classification: 4) What is the heat change when 18.6 g of Hydrogen reacts with excess O2 according to the following equation? 2H2 + 02 → H20 + 571.6kJ Classification: 5) What is the heat change when 5.81 g of graphite reacts with excess H2 according to the following equation? 6C(graphite) + 3H2 +49.03KJ → C6H6

Classification: 2) What is the heat change when 1.48 g of Chlorine reacts with excess phosphorus according to the following equat 2P + 5C12 2PCI5+ 886kJ Classification: 3) What is the heat change when 13.7 g of Nitrogen reacts with excess O2 according to the following equation? N2 + O2 2NO AH° = -180kJ Classification: 4) What is the heat change when 18.6 g of Hydrogen reacts with excess O2 according to the following equation? 2H2 + 02 → H20 + 571.6kJ Classification: 5) What is the heat change when 5.81 g of graphite reacts with excess H2 according to the following equation? 6C(graphite) + 3H2 +49.03KJ → C6H6

Living By Chemistry: First Edition Textbook

1st Edition

ISBN:9781559539418

Author:Angelica Stacy

Publisher:Angelica Stacy

ChapterU5: Fire: Energy , Thermodynamics, And Oxidation-reduction

Section: Chapter Questions

Problem SIV3RE

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Concept explainers

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.

Question

3. Endo or exothermic?

Classification:
2) What is the heat change when 1.48 g of Chlorine reacts with excess phosphorus according to the following equat
2P +5C12
- 2PCI5 + 886kJ
Classification:
3) What is the heat change when 13.7 g of Nitrogen reacts with excess O2 according to the following equation?
N2 + O2
2NO
AH° = -180KJ
Classification:
4) What is the heat change when 18.6 g of Hydrogen reacts with excess O2 according to the following equation?
2H2 + O2 H20
+ 571.6kJ
->
Classification:
5) What is the heat change when 5.81 g of graphite reacts with excess H2 according to the following equation?
6C(graphite) + 3H2 +49.03KJ → C6H6

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