A.- ¿En qué consiste ajustar una ecuación química?b.- Escriba los 2 métodos para ajustar la ecuación química y en qué consiste cada uno de ellos c.- Balancear las siguientes reacciones por el método de tanteo
C3 H8 + O2 CO2 + H2 O
Na2 CO3 + HCl NaCl + CO2 + H2 O
PBr3 + H2 O HBr + H3 PO3
CaO + C CaC2 + CO
H2 SO4 + BaCl2 BaSO4 + HCl

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..