3. a man of mass 80 kg standing at the top of a tall
building has 96000 j of g. p.e. how tall is the
building?

122.45 meters

Explanation:

G.P.E is m*g*h

The mass is 80 kg and gravity is 9.8 m/s². The G.P.E is 96000 J

Plug those in to the equation

96000=80*9.8*h

Multiply 80 and 9.8 to get 784

96000=784h

Divide by 784 on both sides to get h=122.45 meters

Hope this helps

  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

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