A 0.262 g sample of a gas occupies 1.57 L at 776 torr and 25.0 °C.?

A 0.262 g sample of a gas occupies 1.57 L at 776 torr and 25.0 °C.

1) What is the formula mass of the unknown gas?

2) If the gas is an element, which element is it? Enter element symbol (the answer is case sensitive).

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