How do you think engineers use the specific heat of various substances when they are designing new products?

Chemistry

1 answer:

Snezhnost [94]3 years ago

5 0

Answer:

engineers use knowledge of heat of reaction to predict how much energy will be produced in a chemical system, which is important for keeping the reactor safe and efficient. Beyond chemical reactions, heat is exchanged for physical reactions, too.

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JulijaS [17]

Answer:

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Explanation:

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4 years ago

Determine the heat of reaction (ΔHrxn) for the reaction of calcium carbonate (CaCO3) with HCl to produce CO2 by using heat of fo

andrey2020 [161]

Answer: The heat of reaction (ΔHrxn) for the reaction is -164.9kJ

Explanation:

The given balanced chemical reaction is,

$CaCO_3(s)+2HCl(g)\rightarrow CaCl_2(s)+CO_2(g)+H_2O(g)$

To calculate the enthalpy of reaction $(\Delta H^o)$ .

$\Delta H^o=H_f_{product}-H_f_{reactant}$

$\Delta H^o=[n_{CaCl_2}\times \Delta H_f^0_{(CaCl_2)}+n_{CO_2}\times \Delta H_f^0_{(CO_2)}+n_{H_2O}\times \Delta H_f^0_{(H_2O)}]-[n_{CaCO_3}\times \Delta H_f^0_{(CaCO_3)+n_{HCl}\times \Delta H_f^0_{(HCl)}]$

where,

$\Delta H^o_f_{(CaCO_3(s))}=-1206.9kJ/mol\\\Delta H^o_f_{(HCl(g))}=-92.30kJ/mol\\\Delta H^o_f_{(CaCl_2(s))}=-877.1kJ/mol\\\Delta H^o_f_{(H_2O(g))}=-285.8kJ/mol\\\Delta H^o_f_{(CO_2(g))}=-393.51kJ/mol$