When did leroux and shamaonov discover the microwave radiation? why did they not realize the importance of their discovery?

Me with this and you will be marked brainliest

Contains chemical energy. a. heat b. light c. natural gas

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume