Anyone please help me out in this last one?

Calculate the number of moles of ethane in 100 grams

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation: