Refrigerant-134a at 700 kpa, 70°c, and 8.6 kg/min is cooled by water in a condenser until it exists as a saturated liquid at the same pressure. the cooling water enters the condenser at 300 kpa and 15°c and leaves at 25°c at the same pressure. determine the mass flow rate of the cooling water required to cool the refrigerant. the enthalpies of r-134a at the inlet and exit states are 308.34 kj/kg and 88.82 kj/kg. the enthalpies of compressed water at both states are 62.98 kj/kg and 104.83 kj/kg.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.