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Our power outlets provide 120V of electrical potential. If your computer draws 4A of current from the outlet, what is the effective resistance of your computer?

30Ω

Explanation:

Given that,

Electrical potential (V) = 120V

Current drawn (I) = 4A

Effective resistance of your computer (R) = ?

Recall that voltage is the product of current and resistance

i.e V = I x R

120V = 4A x R

R = 120V / 4A

R = 30Ω (The unit of resistance is ohms, and its symbol is Ω)

Thus, the effective resistance of your computer is 30Ω

  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