If a compound made of molecules melts at -77.7 C, is it a solid, liquid or a gas at room temperature?

Answer 1

Liquid or gas, probably liquid. Room temperture is 20 C. so if it melts at -77, that mean it cannot be solid at room temperature.

Answer 2

Indeed, you know it is not a solid, since room temp. is 20 degrees C.

This is all you really know from the information. Where does it boil? Since there is no mention of boiling point one would assume it to be a liquid.