Could be any two or three of the choices please help the options are A) Hydrogen and Carbon

B) Water, Carbon and hydrogen

C) Ethylene and Acetylene

D) Water, Ethylene and Acetylene

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

What energy is it when you flip on a switch on a lamp