The light from one end of the milky way galaxy takes about 150,000 years to travel to the other end. which of these statements is correct about the milky way galaxy?
a: the distance between the two ends of the galaxy is 150,000 light years.
b: it would take 150,000 years to photograph one end of the galaxy from the other end.
c: both ends of the galaxy would meet if they move a distance of 75,000 kilometers each.
d: both ends of the galaxy would meet if they move towards each other at the rate of 75,000 kilometers per hour.

  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

powerful computers now, not then