En un recipiente hay 8, 5 \ , g de amoníaco (NH_3) y se eliminan 1, 5 \ times10 ^ {23} moléculas de amoníaco?

Dado que la masa molecular del amoniaco es 14·1 + 3·1 = 17 g / mol, los 8, 5 g de amoniaco son :

<img src="https://tex.z-dn.net/?f=8%2C5%5C%20g%5Ccdot%20%5Cfrac%7B1%5C%20mol%7D%7B17%5C%20g%7D%20%3D%200%2C5%5C%20mol%5C%20NH_3" />

Vamos a convertir los moles de amoniaco a moléculas :

<img src="https://tex.z-dn.net/?f=0%2C5%5C%20mol%5C%20NH_3%5Ccdot%20%5Cfrac%7B6%2C022%5Ccdot%2010%5E%7B23%7D%5C%20molec%7D%7B1%5C%20mol%7D%20%3D%203%2C011%5Ccdot%2010%5E%7B23%7D%5C%20molec%5C%20NH_3" />

b)Nos quedarán, después de eliminar las <img src="https://tex.z-dn.net/?f=1%2C5%5Ccdot%2010%5E%7B23%7D" /> moléculas :

<img src="https://tex.z-dn.net/?f=%283%2C011%20-%201%2C5%29%5Ccdot%2010%5E%7B23%7D%5C%20molec%20%3D%20%5Cbf%201%2C511%5Ccdot%2010%5E%7B23%7D%5C%20molec%5C%20NH_3" />

a)Que representan un total de :

<img src="https://tex.z-dn.net/?f=1%2C511%5Ccdot%2010%5E%7B23%7D%5C%20molec%5C%20NH_3%5Ccdot%20%5Cfrac%7B1%5C%20mol%7D%7B6%2C022%5Ccdot%2010%5E%7B23%7D%5C%20molec%7D%20%3D%20%5Cbf%200%2C25%5C%20mol%5C%20NH_3" />

c) Lo convertimos a masa :

<img src="https://tex.z-dn.net/?f=0%2C25%5C%20mol%5C%20NH_3%5Ccdot%20%5Cfrac%7B17%5C%20g%7D%7B1%5C%20mol%7D%20%3D%20%5Cbf%204%2C25%5C%20g%5C%20NH_3" />.