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horsena [70]
3 years ago
9

Which is true regarding the density of air?

Chemistry
1 answer:
Dima020 [189]3 years ago
8 0
Warm air rises, cool falls. (a)
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Aliun [14]

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The molecules of dopamine would be produced in a rat after 60 seconds of a 3.0 mg/kg dose of cocaine is 2.258\times 10^{12} molecules.

Explanation:

Concentration of dopamine = 0.75 μM = 7.5\times 10^{-7} M

1 μM  = 10^{-6} M

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So, molecules in 3.75\times 10^{-12} mol of dopamine :

3.75\times 10^{-12}\times 6.022\times 10^{23}=2.258\times 10^{12} molecules

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