Internal Energy — Prelims Questions

A system absorbs $200,\text{J}$ of heat and does $50,\text{J}$ of work on its surroundings. What is the change in internal energy ($Delta U$) of the system?

For an ideal gas undergoing an isothermal expansion, which of the following statements is true?

Calculate the change in internal energy ($Delta U$) for $1$ mole of an ideal monatomic gas heated from $25^circ\text{C}$ to $75^circ\text{C}$ at constant volume. (Given $R = 8.314,\text{J mol}^{-1}\text{K}^{-1}$)

In a bomb calorimeter, a reaction releases $1500,\text{J}$ of heat. What is the change in internal energy ($Delta U$) for this reaction?

Which of the following statements is INCORRECT regarding internal energy?

A gas expands from $10,\text{L}$ to $20,\text{L}$ against a constant external pressure of $2,\text{atm}$. If the gas absorbs $500,\text{J}$ of heat during this process, what is the change in internal energy ($Delta U$)? (Given $1,\text{L atm} = 101.3,\text{J}$)