4: Question 2 - 10.0 pts possible Which statement about the concept of
work, as defined by physics, is false?
O 1. No work is done by a force if the object moves
in a direction perpendicular to the direction
along which the force acts.
O 2. No work is done by a force on an object that
moves with constant velocity, where the ve-
locity does not have a component along the
direction of the force.
O 3. A given force acting on an object may or may
not be doing work.
O 4. No work is done by a force if the object on
which the force is acting does not move.
O 5. All of the statements are true; none is false.

5. All of the statements are true; non is false

Explanation:

b would be the answer

  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