A deep-sea diving gas cylinder contains a mixture of 12.0 g of helium gas (He\text{He}He) and 56.0 g of nitrogen gas (N2\text{N}_2N2). The total pressure inside the cylinder is 180 kPa.
What is the partial pressure, in kPa\text{kPa}kPa, of nitrogen in this mixture?
108108108
72.072.072.0
103103103
148148148