Force = mass x acceleration. what is the correct unit of force?

a. kgm/second/second or newton

b. meters/second

c. kg/second

d. meters/second/second

The only thing in that messy list of choices that can be a unit of force is the Newton.

But this is not to say that choice-A is entirely correct ... "kgm/second/second" is pretty meaningless, and is NOT the same thing as a Newton.

1 Newton = 1 kgm-meter/second/second

choice-B . . . . . unit of speed

choice-C . . . . . rate of change of mass; no name

choice-D . . . . . unit of acceleration

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

  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