A Monatomic Ideal Gas Undergoes an Isothermal Expansion At $300 \mathrm {~K}$

A monatomic ideal gas undergoes an isothermal expansion at $300 \mathrm {~K}$ , as the volume increased from $0.010 \mathrm {~m} ^ { 3 }$ to $0.040 \mathrm {~m} ^ { 3 }$ . The final pressure is $130 \mathrm { kPa }$ . What is the change in the internal (thermal) energy of the gas during this process? $( R = 8.31 \mathrm {~J} / \mathrm { mol } \cdot \mathrm { K } )$

A) $3.6 \mathrm {~kJ}$
B) $- 7.2 \mathrm {~kJ}$
C) $- 3.6 \mathrm {~kJ}$
D) $7.2 \mathrm {~kJ}$
E) $0.0 \mathrm {~kJ}$