Which electron transition results in the emission of energy? a. 3p to 3s c. 2s to 2p

The electron transition that results in the emission of energy is  3p to 3s.

According to the Bohr model of the atom, energy is emitted when an electron in an atom moves from a higher to a lower energy level. The energy emitted is equal to the energy difference between the two energy levels.

The energy level 3p is higher than the energy level 3s. Therefore, when an electron moves from 3p to 3s, there is emission of energy.

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im not to sure what it is

  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