Upon an experimental process, a round-bottomed glass flask (evacuated) weighs 62.0 g when its empty. In the following step, this flask was fulfilled with a liquid (d: 0.98g/mL) and weighs 160.0 g. The same flask used again in another experiment and weighs 62.5 g when fulfilled with an ideal gas (experimental conditions: 760mmHg and 300K) According to this data, calculate the molecular weight of the ideal gas.

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