Beginning with the equation, ρR = ρsubstance /ρwater show that , Relative Density = mass of substance / mass of water
i. e ρR = msubstance /mwater , if the volume are equal
( you must prove that the equation is true)​

we know,

let the mass of substance be

and volume be

density of substance :

now, let the mass of water be

and volume be

density of water :

relative density :

since, volume is same they would cancel off

proved...

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

  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