How many electrons are in 0.990 oz of a pure gold coin?

Atomic number of gold, = 79 means there are 79 electrons in per atom of gold.

Atomic mass of gold = 196.967 gm

0.990 oz of gold is given.

Now, converting

So,

Now, for determining the number of moles, the formula for number of moles is:

Substituting the values:

1 mole of

So, for 0.1425 mole of

Since 1 atom of gold has 79 electrons so,

Number of electrons =

So, number of electrons in 0.990 oz of pure gold coin is .

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).

the correct answer is:

a. formation of precipitation