Question

Сколько молекул содержится в 9 гр серной кислоты срочно пж!!!!!!

Answer 1

Дано :

m(H₂SO₄) = 9 г.

Найти :

N(H₂SO₄) = ?

Решение :

$n = \frac{m}{M}.$

$M(H_{2} SO_{4} ) = 2A_{r} (H) + A_{r} (S)+4A_{r} (O)= 2*1 + 32 + 4*16 = 2 + 32 +64 = 98$ г/моль.

n = m(H₂SO₄) : M(H₂SO₄) = 9 г : 98 г/моль ≈ 0,09 моль.

$n = \frac{N}{N_{A} }$ ($N_{A}$ = 6,02*10²³ моль⁻¹ при нормальных условиях).

N(H₂SO₄) = n(H₂SO₄)*$N_{A}$ = 0,09 моль*6,02*10²³ моль⁻¹ = 5,418*10²² молекул пр нормальных условиях.

Ответ :

5,418*10²² молекул при нормальных условиях.

Answer 2

Calculation of the Number of Molecules in 9 grams of Sulfuric Acid

To calculate the number of molecules in 9 grams of sulfuric acid (H2SO4), we need to use the concept of molar mass and Avogadro's number.

1. Find the molar mass of sulfuric acid (H2SO4): - The molar mass of hydrogen (H) is approximately 1 gram per mole. - The molar mass of sulfur (S) is approximately 32 grams per mole. - The molar mass of oxygen (O) is approximately 16 grams per mole. - Since sulfuric acid has two hydrogen atoms, one sulfur atom, and four oxygen atoms, we can calculate its molar mass as follows: Molar mass of H2SO4 = (2 * molar mass of H) + (1 * molar mass of S) + (4 * molar mass of O) = (2 * 1 g/mol) + (1 * 32 g/mol) + (4 * 16 g/mol) = 2 g/mol + 32 g/mol + 64 g/mol = 98 g/mol

2. Calculate the number of moles of sulfuric acid: - We can use the formula: moles = mass / molar mass - In this case, the mass is 9 grams and the molar mass is 98 grams per mole. - Therefore, the number of moles of sulfuric acid is: Moles of H2SO4 = 9 g / 98 g/mol ≈ 0.0918 moles

3. Calculate the number of molecules: - Avogadro's number states that there are approximately 6.022 x 10^23 molecules in one mole of a substance. - Therefore, the number of molecules in 0.0918 moles of sulfuric acid is: Number of molecules = Moles of H2SO4 * Avogadro's number = 0.0918 moles * 6.022 x 10^23 molecules/mol ≈ 5.52 x 10^22 molecules

So, there are approximately 5.52 x 10^22 molecules in 9 grams of sulfuric acid.