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nevsk [136]
3 years ago
13

What is the mass of an original 5.60-gram sample of iron-53 that remains unchanged after 25.53 minutes?

Chemistry
1 answer:
olga_2 [115]3 years ago
4 0
Answer is 0.7 g

Reason: Given: mass of Fe = 5.60 gWe know that, half life of Fe-53 = t1/2 (Fe-53) = 8.51 min.
Thus, after 25.53 mins, number of half life passed = 25.53/8.51= 3

Now, Amount left after first half life = 5.60g/2 = 2.80 g
Amount left after second half life = 2.80g/2 = 1.40 g
Amount left after third half-life = 1.40g/2 = 0.7g.
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The molecular weight of a gas that has a density of 5.75 g/l at stp is __________ g/mol.
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Density of a gas = 5.75 g/L

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Now we have to calculate the molecular weight of a gas.

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