$\overline{)\frac{{\mathbf{P}}_{\mathbf{1}}}{{\mathbf{n}}_{\mathbf{1}}{\mathbf{T}}_{\mathbf{1}}}\mathbf{}\mathbf{=}\mathbf{}\frac{{\mathbf{P}}_{\mathbf{2}}}{{\mathbf{n}}_{\mathbf{2}}{\mathbf{T}}_{\mathbf{2}}}}\phantom{\rule{0ex}{0ex}}{\mathbf{n}}_{\mathbf{2}}\mathbf{}\mathbf{=}\frac{{\mathbf{P}}_{\mathbf{2}}{\mathbf{n}}_{\mathbf{1}}{\mathbf{T}}_{\mathbf{1}}}{{\mathbf{P}}_{\mathbf{1}}{\mathbf{T}}_{\mathbf{2}}}$

A steel cylinder contains 150.0 moles of argon gas at a temperature of 25°C and a pressure of 8.93 MPa. After some argon has been used, the pressure is 2.00 MPa at a temperature of 19°C. What mass of argon remains in the cylinder?

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