3 years ago

Find the density of an object that has a mass of 5 kg and a volume of 50 cm3?

Chemistry

1 answer:

myrzilka [38]3 years ago

4 0

Density = mass / volume

Mass = 5 kg

Volume = 50 cm³

d = 5 / 50

d = 0,1 kg/cm³

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$0.4167\ \text{M}^{-1}\text{min}^{-1}$

Explanation:

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${t_{1/2}}A=2\ \text{min}$

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$\dfrac{{t_{1/2}}_A}{{t_{1/2}}_B}=\left(\dfrac{{[A]_0}_B}{{[A]_0}_A}\right)^{n-1}\\\Rightarrow \dfrac{2}{4}=\left(\dfrac{0.6}{1.2}\right)^{n-1}\\\Rightarrow \dfrac{1}{2}=\left(\dfrac{1}{2}\right)^{n-1}$

Comparing the exponents we get

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The order of the reaction is 2.

$t_{1/2}=\dfrac{1}{k[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{t_{1/2}[A]_0^{n-1}}\\\Rightarrow k=\dfrac{1}{2\times 1.2^{2-1}}\\\Rightarrow k=0.4167\ \text{M}^{-1}\text{min}^{-1}$