When a space vehicle reenters the earth's atmosphere, energy is transformed into energy.

1. Kinetic energy

2. Heat

Explanation:

When a space vehicle reenters the Earth's atmosphere, kinetic energy is transformed into heat energy. Because Earth's atmosphere contains so many gas and dust particles which provide friction to fast moving space vehicle and generate lots of heat. Since space is vaccume so there is no problem of heat generation but at atmospheric level we have to control speed of space vehicles.

i think the answer is a, hope this is right, that would be my best guess.

  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