QUESTION TWO A cylinder 220 mm in diameter and 3 m long is concentric with a pipe of 210 mm inside
diameter. Between cylinder and pipe there is an oil film. What force is required to move
the cylinder along the pipe at a constant velocity of 2 m/s? The kinematic viscosity of the
oil is 5.6 x 104 m²/s with density of 880 kg/m"".
[11 mks]
pipe
oil film
Cylinder
110 mm
105 mm

  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

your answer is c! hope this : )