Question

how many molecules of H2SO4 are there in a 49g sample ?

Answer 1

Molecular mass of H2SO4 = 98g = 1 mole of molecules

49g have 0.5 mole of molecules.

Answer 2

Hello friend

____________________________

Let's write the given:

Mass of Sulphuric (H2SO4) = 49g

We have the number of molecules in 49g of H2SO4

explanation=)

Molecular mass of H2SO4 = (Atomic mass of H) x 2 + (Atomic mass of S) x 1 + (Atomic mass of O) x 4

Molecular mass of H2SO4 = ( 1 x 2) + (32 x 1) + (16 x 4)

= 2 + 32 + 64

= 98.

Now,

According to the formula,

Number of moles in the given H2SO4(n)

= Mass of H2SO4 in grams/Molecular mass of H2SO4

= 49/98

= 1/2

= 0.5

: n = 0.5 mol

: 1 mol of H2SO4 contains 6.022 x 10^23 molecules.

: 0.5 mol of H2SO4 contains 0.5 x 6.022 x 10^23 molecules.

= 3.011 x 10^23 molecules .

that is 49 g of H2SO4 contains 3.011 x 10^23 molecules of H2SO4.

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