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Temka [501]
3 years ago
9

One g of U-235 produces approximately how much more energy than 1 g of coal? (a) 3,000 times, (b) 19,000 times, (c) 80,000 times

,(d) 400,000 times, (e) 2,000,000 times.
Chemistry
1 answer:
Artist 52 [7]3 years ago
3 0

2,000,000 times

Explanation:

One gram of U-235 produces approximately 2,000,000 times more energy than one gram of coal.

The energy in 1g of U-235 is a nuclear energy whereas energy obtained from coal is chemical energy by combustion. During combustion chemical bonds are broken between the carbon atoms.

  • Uranium decays the radioactive fission.
  • When it is bombarded with particles, an artificial disintegration is induced.
  • Most nuclear reactions are chain reactions in which one step leads to another until stability is produced.
  • Each step produces energy for the next process.

Learn more:

Non-renewable resource brainly.com/question/2948717

#learnwithBrainly

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The boiling point of water is 100.0°C at 1 atmosphere. How many grams of sodium acetate (82.04 g/mol), must be dissolved in 283.
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Answer:

I have to weight 10,04 g of acetate sodium

Explanation:

This is the colligative propertie about elevation of boiling point

ΔT = Kb . m . i  

ΔT is the difference between T° at boiling point of the solution - T° at boiling point of the solvent pure  - we have this data 0,450°C

Kb means ebulloscopic constant (0,52 °C.kg/m .- a known value for water)

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i means theVan 't Hoff factor (degree of dissociation for a compound)

For the sodium acetate is 2

NaCH3COO ---> Na+  + CH3COO-

0,450°C = 0,52°C.kg/m . m . 2

0,450°C / (0,52°C.kg/m . 2) = m

0,432 m/kg = m

This number means I have 0,432 moles of acetate sodium, my solute in 1kg of water, my solvent. But I don't have 1000 g (1kg) I only have 283 g so let's make the rule of three:

1000 g _____ 0,432 moles

283 g ______ (283g .0,432m) / 1000g = 0,122 moles

Now that I have the moles of acetate sodium, I have to find the mass.

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