2 years ago

Which of the following diagrams represents a single replacement reaction?

Chemistry

1 answer:

kari74 [83]2 years ago

3 0

Answer:

It's a, trust me I'm very good with chemistry

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What is the half-life of a pharmaceutical if the initial dose is 500 mg and only 31 mg remains after 6 hours?

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Answer:

$\large \boxed{\text{b. 1.5 h}}$

Explanation:

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$\begin{array}{rcl}\ln \left (\dfrac{500}{31}\right) & = & k \times 6\\\\\ln 16.1 & = & 6k\\2.78& =& 6k\\k & = & \dfrac{2.78}{6}\\\\& = & 0.463 \text{ h}^{-1}\\\end{array}$

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