Question

find out the total number of molecules in H2O and H2SO4​

Answer 1

Explanation:

: 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 .

Answer 2

Answer:

Calculate the moles of H₂SO₄ , then multiply the moles by Avogadro's number, 6.022 × 10²³.

Calculate the moles of H₂SO₄ in 20 g.

moles (n) = mass (m)/molar mass (M)

m(H₂SO₄) = 20 g H₂SO₄

M(H₂SO₄) = (2 × 1 g/mol H) + 32 g/mol S + (4 × 16 g/mol O) = 98 g H₂SO₄/mol H₂SO₄

n(H₂SO₄) = 20 g H₂SO₄/98 g H₂SO₄/mol H₂SO₄ = 0.204 mol H₂SO₄

Calculate the number of molecules of H₂SO₄ in 0.204 mol.

1 mole of molecules = 6.022 × 10²³ molecules

0.204 mol H₂SO₄ × 6.022 × 10²³ H₂SO₄ molecules/mol H₂SO₄ = 1 × 10²³ H₂SO₄ molecules (rounded to one significant figure)

There are approximately 1 × 10²³ H₂SO₄ molecules in 20 grams of H₂SO₄.