If the speed of the light in vacuum is 3x 10/8 find the absolute refractive index of the medium in which the light travels with a speed of 1.2; 10/8m/s

refractive index = 2.5

Explanation:

Refractive index given by the ratio of speed of light in air or vaccum to the speed of light in the medium

ñ = C/V

where C = speed of light in vacuum

v = Speed of light in medium

(3.0 × 10^8)/( 1.2 ×10^8)

= 2.5 ✓

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

the bal will not change its velocity.