The tendency to cause a rotation is measured as the torque. the torque (τ, lowercase greek tau) depends both on the magnitude of the force (f) and on a distance called the lever arm (ℓ). as a formula, τ = fℓ. the units for torque are newton*meters (n*m) the most straightforward torque calculation involves a force that is applied perpendicular to a board which has a hinge at one end (the board will rotate around the hinge). in the following example a force of 78.0 n is applied perpendicular to the board at a distance 1.26 m from the hinge. what is the magnitude of the torque?

  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

it would be c. predictability

answer is slate

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