How high will a ball of mass 2 kg thrown with velocity 4 m/s straight up travel before it starts to fall down again? How far will an object of mass 2 kg sliding on a surface with initial velocity 4 m/s travel before it comes to a complete stop, if it experiences a constant friction force of 2 N? If the object in the previous question were to travel twice as fast initially, how much further would it travel before it came to rest? A. It would go 1.4 times as far. B. It would travel the same distance. C. It would travel 4 times as far. D. It would go twice as far.

  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