For the changc Cdiamand ⟶Cgraphite , ΔH=1.89 kJ If 6 g of diamond and 6 g of graphite are sc

step 1 For the change, carbon in diamond form to carbon in graphite form, delta H is 1 .89 kilojowl. If

For the changc Cdiamand ⟶Cgraphite , ΔH=1.89 kJ If 6 g of...

For the changc $\mathrm{C}_{\text {diamand }} \longrightarrow C_{\text {graphite }}, \Delta H=1.89 \mathrm{~kJ}$ If $6 \mathrm{~g}$ of diamond and $6 \mathrm{~g}$ of graphite are scparatcly burnt to yicld $\mathrm{CO}_{2}$ the hcat liberated in the first case is(1) less than in the second case by $1.89 \mathrm{~kJ}$ (2) less than in the second case by $11.34 \mathrm{k}$. (3) less than in the second case by $14.34 \mathrm{k}$.] (4) more than in the second case by $0.945 \mathrm{~kJ}$

For the changc $\mathrm{C}_{\text {diamand }} \longrightarrow C_{\text {graphite }}, \Delta H=1.89 \mathrm{~kJ}$ If $6 \mathrm{~g}$ of diamond and $6 \mathrm{~g}$ of graphite are scparatcly burnt to yicld $\mathrm{CO}_{2}$ the hcat liberated in the first case is(1) less than in the second case by $1.89 \mathrm{~kJ}$
(2) less than in the second case by $11.34 \mathrm{k}$.
(3) less than in the second case by $14.34 \mathrm{k}$.]
(4) more than in the second case by $0.945 \mathrm{~kJ}$

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Key Concepts

Stoichiometry in Thermochemistry

Stoichiometry in thermochemistry is the quantitative relationship between reactants and products in a chemical reaction. It involves converting between the mass of a substance and the number of moles to accurately calculate energy changes, ensuring that enthalpic differences are appropriately scaled to the amounts of reactants used.

Combustion Reactions

Combustion reactions involve the rapid oxidation of a substance in the presence of an oxidizer, typically oxygen, resulting in the formation of combustion products and the release of energy. This type of reaction is fundamental in thermochemistry as it provides insight into the energy content of fuels and other compounds.

Enthalpy Change

Enthalpy change is the heat absorbed or released during a chemical reaction at constant pressure. It is a key thermodynamic parameter that represents the energy difference between reactants and products, and it is used to determine whether a reaction is exothermic or endothermic.

Allotropy

Allotropy refers to the existence of an element in more than one structural form in the same physical state. Different allotropes have distinct physical and chemical properties due to variations in the arrangement of atoms, which in turn affects their stability and energy content.

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