Question

the number of oxygen atoms in 4.4g of CO2 is approximately
(a) 1.2x10²³
(b) 6x10²²
(c) 6x10²³
(d) 12x10²³​

Answer 1

Answer:

hi mate

correct ans is

option a

hope it helps you

Answer 2

Explanation:

1 mole of carbon dioxide contains 6.022×10236.022×1023atoms and two oxygen atoms per CO2 molecule. At a given mass, the number of moles can be calculated and using unitary method, the number of oxygen atoms in a specific amount of CO2can be determined.

Formula used:

moles= given mass/molar mass

Complete step by step answer:

Moles is the unit of measurement of the amount of a substance as per International System of Units. It is defined as exactly Avogadro’s number i.e. 6.022×10^23 particles, particles can either be atoms or molecules. It can be calculated by the ratio of given mass to molar mass for any molecule or compound.

We know that the molar mass of CO2 is 44gms.

We are provided the given mass as 4.4gms.

From these two values, we can determine number of moles by the following formula

moles=given mass/molar mass

Putting the values in it,

we get

moles=4.4 / 44=0.1mole

We know, 1mole of CO2has 6.022×10^23 atoms (Avogadro’s number)

Therefore,

0.1mol of CO2 has 2 oxygen atoms in it, so it will contain

6.022×10^23×2×0.1 / 1

=1.2×10^23

So, the number of oxygen atoms in 4.4g of CO2 is approximately 1.2×10^23

Hence, the correct option is (A).