Question

how to know atomic mass of h2so4,helium and co2 ​

Answer 1

ᴀᴛᴏᴍɪᴄ ᴍᴀss ᴏғ

H2SO4:-

Molecular mass=mass of a hydrogen atom*no.of atoms +mass of sulphur*no.of atoms+mass of oxygen atom *no of atoms

Molecular mass H2SO4= 1*2+32*1+16*4

Molecular mass H2SO4=2+32+64

=98m-u

HELIUM:-

Being one of the lightest elements in the world, Helium has an atomic mass of 4.0026 u. u means Unified Atomic Mass Units. 1 u equals to the mass of 1/12 of the mass of a 12C ( Carbon - 12 ) isotope.

Carbon isotope is considered as the landmark here as it is the most common element used in mass spectrometer which is used to identify isotopes.

So mass of a Carbon - 12 atom is 1.9926 * 10^-23 grams making the atomic mass of Helium equals to { (1.9926 * 10^-23) / 12 }* 4.0026 = 1.6605 * 10^-24 * 4.0026 = 6.6463 * 10^-24 g OR 6.6463 * 10^-27 kg.

C O 2

Answer:

44

Explanation:

Atomic mass is very simple to calculate.

Since carbon dioxide has the structure  

C O 2

There is one carbon and 2 oxygen

so you look to the periodic table to find the atomic mass, which is located under the symbol and name of the element on the periodic table.

Carbon atomic mass of 12 amu

Oxygen atomic mass of 16 amu

since there is 1 carbon and 2 oxygen you calculate it as follows:

1(12)+2(16)=44

ʙᴇ ʏᴏᴜʀs................^_^

Answer 2

add the atomic mass of official atoms, in the molecule. this will give you the atomic mass of a molecule.

for eg:

CO2 -

MASS OF :

C - 12 amu

O - 16 amu

them

them mass of CO2 will be mass of C + mass of 2 O atoms

= 12 + 2x 16

=12 + 32

= 44 amu (for one molecule of CO2)

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