Natural gas flows from a source at 100 bara through 100 m of 0.5-cm ID new commercial steel pipe to atmospheric pressure. The pipe is horizontal. Determine if this flow is choked for the adiabatic and isothermal cases.

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?

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer