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3 years ago

Now that you have exercised, walked your

Chemistry

1 answer:

ASHA 777 [7]3 years ago

4 0

Answer: The moles of melatonin are 0.000043

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

Given mass of melatonin = 0.01 g

Molar mass of melatonin $(C_{13}H_{16}N_2O_2)$ = 232.28 g/mol

$\text{Number of moles of melatonin}=\frac{0.01 g}{232.28g/mol}=0.000043mol$

Thus the moles of melatonin in 0.01 g are 0.000043

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yuradex [85]

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3 years ago

4 Na + O2 → 2 Na2O<br><br> 6.79 moles of O2 will react to form how many moles of Na2O?

Nataly_w [17]

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Explanation:

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3 years ago

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Scilla [17]

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Explanation:

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3 years ago

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tangare [24]

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As each stick represents an valence electron pair.

And there are 14 valence electrons, so there can be 7 valence electron pairs.

And for 7 valence electron pairs, 7 sticks needed.

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4 years ago