20. You have been asked to design an appliance for a water supply pumping station. The appliance will operate using a tree plantation as starting source of energy and the following
supplies only; a steam-powered electric generator, water pump and a light-activated siren
system. Use a flow chart of 7 (seven) items only to describe the sequential energy
conversions to be anticipated,

  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

he made 11 calls in one day

current flows in a wire

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.