How Is Heat Calculated for an Ideal Gas at Constant Volume?

[diredragon]

Homework Statement

An ideal gass is at constant volume risen to a new pressure level of $P_f$. Find te expression for the total heat brought to the system.

Homework Equations

3. The Attempt at a Solution [/B]
So $PV=nRT$ and $E=Q$ $Q=C_v(T_f-T_i)$ so i just have to find $(P_f-P_i)V=nR(Tf-Ti)$ with the last term being what i need...?

 

[Chestermiller]

Homework Statement

An ideal gass is at constant volume risen to a new pressure level of $P_f$. Find te expression for the total heat brought to the system.

Homework Equations

3. The Attempt at a Solution [/B]
So $PV=nRT$ and $E=Q$ $Q=C_v(T_f-T_i)$ so i just have to find $(P_f-P_i)V=nR(Tf-Ti)$ with the last term being what i need...?

The equations you have written can be used, provided you write $Q=nC_v(T_f-T_i)$, where Cv is the molar heat capacity and n is the number of moles.