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2 years ago

If the half-life of a 20.0 g sample is known to be 24 minutes, how long will it take for only 5.0 grams of the sample to remain?

Chemistry

2 answers:

Degger [83]2 years ago

4 0

For a 20g sample it will take 24 minutes therefore for a 5g sample it will take 6 minutes

Katen [24]2 years ago

3 0

its will take 48 minutes

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Step 2 - Finding the molar mass of the substance

To find the molar mass, we need to multiply the molar mass of each element by the number of times it appears in the formula of the substance and, finally, sum it all up.

The molar masses are 12 g/mol for C; 16 g/mol for O and 52 g/mol for Cr. We have thus:

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Step 3 - Finding the percent composition of carbon

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$\begin{gathered} 284\text{ g/mol ---- 100\%} \\ 36\text{ g/mol ----- x} \\ \\ x=\frac{36\times100}{284}=\frac{3600}{284}=12.7\text{ \%} \end{gathered}$

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