Which statement best describes the relationship between an object's density and its index of refraction? A. As the mass per unit volume of the substance increases, the refractive index decreases.

B. As the mass of the object increases, the refractive index decreases.

C. As the physical density of the substance increases, the refractive index increases

D. As the optical density increases, the refractive index increases​

D. As the optical density increases, the refractive index increases

the answer is D

Explanation: I took the test

  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

i guess it’s a and b