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Alex17521 [72]
3 years ago
11

How much does a gold bar wiegh and how much is it wotrth

Chemistry
1 answer:
Katena32 [7]3 years ago
3 0
It depends on the gold bar.  Gold bars come in all diferent sizes.  However how much its worth depends on how big it is.  Gold is $1,320 per ounce.
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Promethium-147 is sometimes used in luminescent paint. It has a half-life of 956.3 days. If 250 grams (g) of promethium-147 is u
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% = 76.75%

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A = A₀ e^(-kt)   (1)

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A and A₀: concentrations or mass of the compounds, (final and initial)

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t: given time

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You should note that this expression is valid when the reaction is of order 1 or first order. In this kind of exercises, we can assume it's a first order because we are not using the isotope for a reaction.

Now, let's calculate k:

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With this value, we just replace it in (1) to get the final mass of the isotope. The given time is 1 year or 365 days so:

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A = 250 e^(-0.7675)

A = 191.87 g

However, the question is the percentage left after 1 year so:

% = (191.87 / 250) * 100

<h2>% = 76.75%</h2><h2>And this is the % of isotope after 1 year</h2>
3 0
2 years ago
Read 2 more answers
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