Question

(e) The energycontent of natural gas is about 39 MJ/m3 (where 1 MJ = 106) Suppose you need to produce 5.0 x 103J of energy. How much volume (in m3) of natural gas do you need? (f) Sea water has a typical salinity of 39 g/L in dissolved salts. Suppose you have 125.0 mL of sea water. How many grams of dissolved salts can you recover? (g) The atmospheric pressure at the surface of planet Mars is 7.5 mbar (as reported by the Phoenix Mars Mission, http://phoenix.lplarizona.edu/). What is the pressure in mmHg (1 bar = 1000 mbar 750.062 mm Hg = 1 bar)? (h) Suppose you have a 75 J/s light bulb (J/s is also call watt, thus it is a 75 watt bulb). Suppose th light bulb was on for 7.200 x 103 s (i.e. 2 hours). How much energy (in kJ) has it used?

Answer 1