Question

Total no. Of atoms in 294g of sulphuric acid

Answer 1

We know that : Formula for Sulphuric Acid is : H₂SO₄

⇒ One Mole of H₂SO₄ weighs : (2 + 32 + 64) = 98 grams

⇒ 3 Moles of  H₂SO₄ weighs : (3 × 98) = 294 grams

But, One Mole of H₂SO₄ Contains : 6.023 × 10²³ Molecules of H₂SO₄

294 grams of H₂SO₄ Contains : 3 × 6.023 × 10²³ Molecules of H₂SO₄

⇒ 294 grams of H₂SO₄ Contains : 1.8 × 10²⁴ Molecules of H₂SO₄

But, One Molecule of H₂SO₄ contains : (2 + 1 + 4) = 7 Atoms

⇒ 294 grams of H₂SO₄ Contains : 7 × 1.8 × 10²⁴ Atoms

⇒ 294 grams of H₂SO₄ Contains : 1.26 × 10²⁵ Atoms

Answer 2

$\huge\blue{As-Salamu-Alykum}$


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Molar mass of H2SO4 = 1×2 + 32 + 16×4


Molar mass of H2SO4 = 98g/mol


Moles of H2SO4 = mass/molar mass


Moles of H2SO4 =294/98


Moles of H2SO4 = 3mol


Moles of H2SO4 = Number of molecules of H2SO4 / Avagadro number


Number of molecules of H2SO4 =Moles × Avagadro number


Number of molecules of H2SO4 = 3 ×6.023×10^23


Number of molecules of H2SO4 = 18.069 ×10^22


Now .....


In one molecule of H2SO4 there are 7 atoms


So......


In 18.069×10^23 number of atoms will be


18.069×10^23 × 7


$\huge\red{Number of atoms of H2SO4 = 126.4×10^23 atoms }$


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