Chemistry, 21.06.2021 16:50 jaici68

Epinephrine (adrenaline) is a hormone secreted into the bloodstream in times of danger and stress. It is 59.0% carbon, 7.15% hydrogen, 26.20% oxygen, and 7.65% nitrogen by mass and has a molar mass of 183 g/mol. Determine the empirical formula for Epinephrine.

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Answer from: JamierW2005

The empirical and molecular formula for the given organic compound is $C_9H_{13}O_3N$

Explanation:

Let the mass of the compound be 100 g

Given values:

% of C = 59.0%

% of H = 7.15%

% of O = 26.20%

% of N = 7.65%

Mass of C = 59.0 g

Mass of H = 7.15 g

Mass of O = 26.20 g

Mass of N = 7.65 g

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Molar mass of C = 12 g/mol

Molar mass of H = 1 g/mol

Molar mass of O = 16 g/mol

Molar mass of N = 14 g/mol

Putting values in equation 1, we get:

$\text{Moles of C}=\frac{59.0g}{12g/mol}=4.917 mol$

$\text{Moles of H}=\frac{7.15g}{1g/mol}=7.15 mol$

$\text{Moles of O}=\frac{26.20g}{16g/mol}=1.6375 mol$

$\text{Moles of N}=\frac{7.65g}{14g/mol}=0.546 mol$

Step 2: Calculating the mole ratio of the given elements.

Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.546 moles

$\text{Mole fraction of C}=\frac{4.917}{0.546 }=9$

$\text{Mole fraction of H}=\frac{7.15}{0.546 }=13$

$\text{Mole fraction of O}=\frac{1.6375}{0.546 }=2.99\approx 3$

$\text{Mole fraction of N}=\frac{0.546}{0.546 }=1$

Step 3: Taking the mole ratio as their subscripts.

The ratio of C : H : O : N = 9 : 13 : 3 : 1

The empirical formula of the compound becomes $C_9H_{13}O_3N_1=C_9H_{13}O_3N$

To calculate the molecular formula, the number of atoms of the empirical formula is multiplied by a factor known as valency that is represented by the symbol, 'n'.

$n =\frac{\text{Molecular mass}}{\text{Empirical mass}}$ .....(2)

We are given:

Mass of molecular formula = 183 g/mol

Mass of empirical formula = 183 g/mol

Putting values in equation 2, we get:

$n=\frac{183g/mol}{183g/mol}=1$

Multiplying this valency by the subscript of every element of empirical formula, we get:

$C_{1\times 9}H_{1\times 13}O_{1\times 3}N_{1\times 1}=C_9H_{13}O_3N$

Hence, the empirical and molecular formula for the given organic compound is $C_9H_{13}O_3N$

Answer from: Quest

explanation:

mitosis

Answer from: Quest

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

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