Chemistry - Thermochemistry Question with Solution | TestHub

ChemistryThermochemistryAdiabatic Process/PolytropicMedium2 minPYQ_2020

ChemistryMediumsingle choice

The heats of combustion of $C_{x} H_{y},$ carbon and hydrogen are a, b and c cal respectively. The heat of formation of $C_{x} H_{y},$ will be:

Options:

Answer:

Solution:

$xC + \frac{y}{2} H_{2} \to C_{x} H_{y} {ΔH}_{f_{CxHy}} = ?$
${ΔH}_{f_{(CxHy)}} = {ΔH}_{{rx}^{n}}$
$= ({ΔH}_{comb ._{CxHy}} - {xΔH}_{comb ._{C}} - \frac{y}{2} {ΔH}_{comb ._{H_{2}}})$
$= a - x (b) - \frac{y}{2} (c)$
$= - (xb + \frac{yc}{2} - a) cal$

Stream:NTA_ABHYASSubject:ChemistryTopic:ThermochemistrySubtopic:Adiabatic Process/Polytropic

⏱ 2mℹ️ Source: PYQ_2020

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