Use the following photoelectric graph to answer the question:

Graph titled Photoelectric Effect for a Photomissive Metal is shown. The y axis is labeled kinetic energy and scales from negative 2 to positive 4 electron volts. The x axis is labeled frequency from 0 to 11 times 10 to the 14 hertz. A straight line connects the points 0, negative 1.2 and 5.5, 1 and 9, 2.5.

If the incoming photon had a frequency of 2.0 E14 Hz, would you have a photo-electron ejected?

No
Yes

  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

battery with hi vtge high val resist in series