Fa 66-m cylindrical bar has a constant density of rhoρequals=55 g/cm for its left half and a constant density rhoρequals=66 g/cm for its right half, what is its mass? what is the correct relationship to use to calculate the mass of the bar? a. massequals=startfraction linear density over length endfraction linear density length b. mass equals linear density times left parenthesis length right parenthesis squaredmass=linear density•(length)2 c. massequals=startfraction length over linear density endfraction length linear density d. massequals=linear density times •len

  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