Which of the following equations violates the law of conservation of mass?

a) 2al + 6hcl yields 2alcl3 + 3h2
b) na2c2o4 + pb(no3)2 yields pbc2o4 + 2nano3
c) agno3 + licl yields agcl + lino3
d) 3ca + 2cr(no3)3 yields 3ca(no3)3 + 2cr

a pan containing water is placed in a positio n where it is exposed to a 10 mile per hour wind. the pan contains a uniform depth of 1.27 cm of water, is quite wide, and has a length of 2.44 m in the wind direction. the water in the pan is at a constant temperature of 15.5 °c.