The following are possible ways to express the quantity 0.391 (give all correct answers, i. e., b, ac, note: 3.45e-8 is a way you can enter the number 3.45×10-8 in most computers. a) 0.000391e4 b) 39.1 x 10-1 c) 0.391e+1 d) 3.91e-1 e) 0.0391e+1 f) 0.00391 x 102

speed

ratio of distance traveled to time interval

net force

vector sum of forces on object

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source of diverging light rays either luminous or illuminated

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explanation:

  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