If a cylinder of volume \(0.1 \mathrm{~m}^{3}\) is filled with \(1.373 \mathrm{~kg}\) of ammonia at \(1.95 \mathrm{MPa}\), determine the temperature at which ammonia exists in the cylinder. Assume that ammonia obeys the van der Waals equation of state. The van der Waals constants \(a\) and \(b\) for ammonia are \(422.546 \times 10^{-3} \mathrm{~m}^{3} / \mathrm{mol}^{2}\) and \(37 \times 10^{-6} \mathrm{~m}^{3} / \mathrm{mol}\) respectively.