q = deltaH

[Shane_Yu_3K]

Hello,

Can someone explain why q = deltaH?

Thank you!

[Emily Nguyen 3L]

Hi!

Enthalpy is defined as the amount of heat released or absorbed at constant pressure, so Qp = delta H, which is H (products)-H (reactants). This is equivalent to n x Cp x delta T, but I'm not exactly sure why. However, both equations do result in the same units (Joules), so there are two ways to calculate Qp (constant pressure).

[SofiaMammaro-1K]

Q=mcΔT Q = mc Δ T , where Q is the symbol for heat transfer, m is the mass of the substance, and ΔT is the change in temperature. The symbol c stands for specific heat and depends on the material and phase. The specific heat is the amount of heat necessary to change the temperature of 1.00 kg of mass by 1.00ºC.

[Sarah Hong 2K]

q is the heat transfer in a system which is equal to delta H because delta H is the enthalpy of a system.

[Arjan G 2H]

Hi! So, qp represents the total amount of heat that is transferred from the inside of the system to the outside of the system, and this can be clearly understood as the enthalpy of the system. Enthalpy measures the change in heat of a reaction, which can also be worded as the total transfer of heat for a reaction to take place. This is why qp=deltaH( the variable representing enthalpy) and how both of these values can be found using the equation g*Csp*deltaT( for specific heat capacity) or n*Cp*deltaT( for molar heat capacity).

[Katherine Li 1A]

Enthalpy is the heat released or absorbed by a reaction at a constant pressure, and Q equals heat. That's why Qp = delta H.

[andreagutierrez 3K]

q=delta H basically shows enthalpy and this equation helps to determine what reaction it can be by using Hproduct-Hreactant.

[Sarah Wang 1I]

Remember that this only stands true when the conditions have CONSTANT pressure!