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4 years ago

The half-life of bismuth is 5 days. How much of a 100 gram sample will remain after 20 days?

1 answer:

8 0

Half-life is the duration needed for a compound to decay into half of its initial weight. In this case, the initial weight is 100gram. The calculation for the final weight should be:

final weight= initial weight * (1/2)^(duration/half-life)
final weight= 100 grams * (1/2)^(20days/5 days)
final weight= 100 grams * (1/2)^(4)
final weight= 100 * 1/16= 100/16 gram= 6.25 grams

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What mass of CaCl2 (in g ) should the chemist use?

solmaris [256]

The mass of the solute required is 250.25 g.

<h3>What is the mass of the solute?</h3>

We know that the number of moles of the solute can be used to obtain the mass of the solute that is required. We can now try to find the mass of the solute that is required.

Concentration of the solution = 0.350M

Volume of the solution = 6.5 L

Number of moles of the solute = 0.350M * 6.5 L

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Th measured mass of the solute that we would have to use is 250.25 g.

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A chemist wants to make 6.5 L of a .350M CaCl2 solution. What mass of CaCl2(in g) should the chemist use?

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3 years ago

If you could drop 12 atoms of copper onto a beaker containing nitric acid, how many molecules of NO would be produced?

Dahasolnce [82]

Answer:

B) 8.0 molecules.

Explanation:

From the balanced equation: 3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O,

It is clear that 3.0 atoms of Cu react with 8.0 molecules of HNO₃ to produce 3.0 molecules of Cu(NO₃)₂, 2.0 molecules of NO, and 4.0 atoms of H₂O.

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Using cross multiplication:

3.0 atoms of Cu produce → 2.0 molecules of NO, from the balanced equation.

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