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

4 0

3 years ago

Severe droughts cause some lands to become deserts, and this process leads to

Alona [7]

All above

Severe Droughts can make land unlivable, as all living things need food and water to survive

7 0

3 years ago

Read 2 more answers

A flower gardener discover that all the flower he planted could not grow. The farmer requested the services of an agro technicia

sp2606 [1]

I think it’s b because in the question it says that the agro technician ran some tests on the soil and found out that it’s acidic and then after that the farmer should discuss how to remove the acid so the soil can be fit for farming

6 0

2 years ago