Question

How many moles are in 20 grams of Ca

Answer 1

Answer:

$\Large{\boxed{\red{\underline{0.5 \: moles}}}}$

Explanation:

(Ca = Calcium)

Atomic Mass of Calcium = 40u

(Atomic Mass is same as Molar Mass, so)

Molar Mass of Calcium = 40g

(Formula to find number of moles,

$\boxed{\blue{\underline{No. \: of \: moles = \frac{Given \: Mass}{Molar \: Mass}}}}$)

So, No. of Moles = $\frac{Given \: Mass = 20}{Molar \: Mass = 40}$

= $\frac{20}{40}$

= $\frac{1}{2}$

= $\frac{1}{2}$ = 0.5 moles

So, there are $\boxed{\red{\underline{0.5 \: moles}}}$ in 20 grams of Calcium.

^^

Extra Information:

What is Atomic Mass?

Atomic mass is the sum of protons (or electrons) and neutrons in an atom. For example, there are 20 neutrons and 20 protons in Calcium, so 20+20=40u is the atomic mass of Ca.

Its unit is 'u' (known as unified mass).

What is Molar Mass?

The mass of 1 mole of atom of any element, is known as Molar Mass. Its unit is 'g' (gram). Molar mass of any element is same as its atomic mass.

Answer 2

A2nswer:

Explanation: