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miss Akunina [59]
3 years ago
15

Cesium-137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-137 is 30.2 years. How much tim

e is required for the activity of a sample of cesium-137 to fall to 8.32 percent of its original value
Chemistry
1 answer:
Aleonysh [2.5K]3 years ago
5 0

Answer:

la primera va con la última

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Sample A: 300 mL of 1M sodium chloride
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Answer:

Sample A

Explanation:

Molarity of a solution can be calculated using the formula:

Molarity = number of moles (mol) ÷ volume (vol)

For Sample A:

V = 300ml = 300/1000 = 0.3 L

Molarity = 1M

n = number of moles (mol)

1 = n/0.3

n = 0.3moles

For Sample B:

V = 145 mL = 145/1000 = 0.145L

Molarity = 1.5 M

n = number of moles

1.5 = n/0.145

n = 1.5 × 0.145

n = 0.22 moles

Based on the above results (moles), sample A with 0.3 moles contains the larger concentration of sodium chloride.

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Explanation:

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