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6 March, 14:10

He concentration of the appetite-regulating hormone ghrelin is about 1.3 * 10-10 m in the blood of a fasting person. how many molecules of ghrelin are in 1 l of blood?

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  1. 6 March, 14:33
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    To solve this problem, let us first calculate for the number of moles of ghrelin in the blood. This is calculated by using the formula:

    number of moles of ghrelin = Molarity * Volume of blood

    number of moles of ghrelin = (1.3 * 10^-10 mol / L) * (1 L)

    number of moles of ghrelin = 1.3 * 10^-10 mol

    Avogadro’s number states that for every mol of a substance there is approximately 6.022 x 10^23 atoms or molecules of that substance. Therefore converting this into number of molecules:

    number of molecules of ghrelin = 1.3 * 10^-10 mol (6.022 * 10^23 molecules / mol)

    number of molecules of ghrelin = 7.8286 * 10^13 molecules
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