While quarantining, Mr. Johnston picked-up inline skating to fight boredom. One day, Mr. Johnston with a mass of 115 kg was standing in his driveway in his skates (at rest) when out of nowhere his son Emmit who pounsed on his back like a spider monkey. Emmit has a mass of 59 kg and was moving at a velocity of 5.5 m/s. Approximately how fast did Mr. Johnston begin to roll towards the street with Emmit clinging to his back? a
5.5 m/s
b
324.5 kg m/s
c
33 m/s
d
1.9 m/s

  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

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over