Please help.. I am begging A wave's frequency refers to . *

the number of wavelengths passing by a given point in a period of time

the heigh of a wave as it passes a given point

the length of a wave

the strength of a wave

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?