Which equation obeys the law of conservation of mass? H2(g) O2(g) → H2O(g) H2(g) O2(g) → H2O(g) 4He(g) 2H2(g) O2(g) → 2H2O(g) H2(g) → H2O(g) H2(g) O2(g) → 2H2O(g).

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

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.