Physics, 16.09.2019 20:30, sandersmakaylaovq5vu

Acertain battery can power a 100 ohm-resistance device for 4 hours. how long can the battery power a 200 ohm device?

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Too easy:

100Ω/4 sec = 200Ω/t

t= 8 sec

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answered: Guest

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answered: Guest

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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Acertain battery can power a 100 ohm-resistance device for 4 hours. how long can the battery power a...