Question

Вычислите количество вещества содержащегося в 17 г сероводорода h2s (н.у.) сколько молекул содержится в данном образце сероводорода? сколько атомов водорода?

Answer 1

N=m/M
n=17/34=0.5 моль
N=6*10^23*0.5=3*10^23 молекул
N(H)=6*10^23*2*0.5=6*10^23 атомов

Answer 2

Calculation of the Amount of Substance in Hydrogen Sulfide (H2S)

To calculate the amount of substance contained in 17 g of hydrogen sulfide (H2S) at standard conditions (n.u.), we can use the molar mass of H2S and the formula:

Amount of Substance (n) = Mass (m) / Molar Mass (M)

The molar mass of H2S can be calculated by adding the atomic masses of hydrogen (H) and sulfur (S):

Molar Mass of H2S = 2 * Atomic Mass of H + Atomic Mass of S

To determine the number of molecules in the given sample of hydrogen sulfide, we can use Avogadro's number, which states that one mole of any substance contains 6.022 x 10^23 particles (atoms, molecules, or formula units).

To calculate the number of molecules, we can use the formula:

Number of Molecules = Amount of Substance (n) * Avogadro's Number

Finally, to determine the number of hydrogen atoms in the given sample, we can multiply the number of molecules by the number of hydrogen atoms in one molecule of H2S, which is 2.

Let's perform the calculations:

1. Calculate the molar mass of H2S: - Atomic Mass of H = 1.008 g/mol (source - Atomic Mass of S = 32.06 g/mol (source - Molar Mass of H2S = 2 * 1.008 g/mol + 32.06 g/mol = 34.076 g/mol

2. Calculate the amount of substance (n): - Mass (m) = 17 g - Molar Mass (M) = 34.076 g/mol - Amount of Substance (n) = 17 g / 34.076 g/mol = 0.499 mol (approximately)

3. Calculate the number of molecules: - Avogadro's Number = 6.022 x 10^23 molecules/mol - Number of Molecules = 0.499 mol * 6.022 x 10^23 molecules/mol = 3.011 x 10^23 molecules (approximately)

4. Calculate the number of hydrogen atoms: - Number of Hydrogen Atoms = 2 * Number of Molecules = 2 * 3.011 x 10^23 molecules = 6.022 x 10^23 hydrogen atoms

Therefore, in the given sample of 17 g of hydrogen sulfide (H2S) at standard conditions, there are approximately 3.011 x 10^23 molecules of H2S and 6.022 x 10^23 hydrogen atoms.