The atomic mass of calcium is 40.08. What is the mass of 6.02 × 1023 atoms of calcium?

In

1

m

o

l

of

C

a

atoms

, there are

N

A

individual calcium atoms.

Explanation:

How does this help you? Well, it happens that

N

A

,

Avogadro's Number

≅

6.022

×

10

23

⋅

m

o

l

−

1

.

And it is stated on your trusty Periodic Table that the molar mass of

C

a

is

40.08

⋅

g

⋅

m

o

l

−

1

. So, if we specify a molar quantity, we specify a precise number of atoms and molecules that can be approximated by mass.

Explanation:

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).