Question

Calculate the mass of (i) an atom of silver (ii) a molecule of carbon dioxide.

Answer 1

Atomic mass of silver =108u=1.7911934 × 10^-22 g

Molecular mass of CO2=44u=7.3064×10^-23

1u=1.6605×10^-24

Answer 2

Answer:

i)107.8683 u

ii) 7.3065× 10^23gm

Explanation:

i)Silver has atomic number of approx 107.9

1 mole of silver = 107.9g & there are 6.02×10^23(Avogadro number)atoms in 1 mole.

To find the mass of one atom we must divide the mass by Avodgadro's constant as they are unevenly distribution of mass.

ii) No.of molecules = no.of moles × Avogadro number.

No. of moles = No.of moles / Avogadro number

No. of moles = 1 / 6.022×10^23

As we know,

No.of moles = mass of compound /molecular weight of the compound

Mass of compound = No.of moles × molecular weight of CO2

Molecular weight of CO2=(1×12+2×16)

= 12+32=44

Mass = 1/6.022×10^23×44

Mass= 7.3065×10^23 g