Question

ДАЮ 40 БАЛЛОВ СРОЧНО ОЧЕНЬ ОЧЕНЬ 3.Определите простое вещество, образец которого количеством 6,5 моль имеет массу 364г . 5. Найдите, сколько молекул содержится в 1 л воды, в 1 литре СН4? 6. Рассчитать плотность газа Н2S при нормальных условиях.

Answer 1

3) определяем вещество, для этого находим молярную массу
364/6.5=56
находим в таблице что это KOH
Ответ: KOH.
6) определяем плотность газа
34/22.4=1.5392г/л
Ответ: 1.5392 г/л

Answer 2

Simple Substance with a Sample of 6.5 moles and Mass of 364g

The simple substance with a sample of 6.5 moles and a mass of 364g can be determined by using the formula:

Number of moles = Mass / Molar mass

To find the molar mass of the substance, we divide the mass by the number of moles:

Molar mass = Mass / Number of moles

Using the given values, we can calculate the molar mass of the substance:

Molar mass = 364g / 6.5 mol

Calculating this, we find that the molar mass of the substance is approximately 56g/mol.

Unfortunately, the search results did not provide a specific substance that matches the given molar mass and sample size. However, you can use the calculated molar mass to identify possible substances by referring to a periodic table or consulting a chemistry textbook.

Number of Molecules in 1 Liter of Water and 1 Liter of CH4

To determine the number of molecules in 1 liter of water and 1 liter of CH4 (methane), we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

1. Number of molecules in 1 liter of water: - The molar mass of water (H2O) is approximately 18g/mol. - Using the molar mass and Avogadro's number, we can calculate the number of molecules: - Number of molecules = Number of moles x Avogadro's number - Number of moles = Volume (in liters) / Molar volume at STP (22.4 L/mol) - Number of moles = 1 L / 22.4 L/mol - Number of moles ≈ 0.0446 mol - Number of molecules ≈ 0.0446 mol x 6.022 x 10^23 molecules/mol

2. Number of molecules in 1 liter of CH4: - The molar mass of CH4 is approximately 16g/mol. - Using the molar mass and Avogadro's number, we can calculate the number of molecules: - Number of molecules = Number of moles x Avogadro's number - Number of moles = Volume (in liters) / Molar volume at STP (22.4 L/mol) - Number of moles = 1 L / 22.4 L/mol - Number of moles ≈ 0.0446 mol - Number of molecules ≈ 0.0446 mol x 6.022 x 10^23 molecules/mol

Unfortunately, the search results did not provide the exact number of molecules in 1 liter of water and 1 liter of CH4. However, using the calculations above, you can approximate the number of molecules based on the given volume and molar mass.

Density of H2S Gas at Normal Conditions

To calculate the density of H2S gas (hydrogen sulfide) at normal conditions, we need to know the molar mass of H2S and the molar volume at standard temperature and pressure (STP).

1. Molar mass of H2S: - The molar mass of hydrogen (H) is approximately 1g/mol, and the molar mass of sulfur (S) is approximately 32g/mol. - The molar mass of H2S can be calculated as follows: - Molar mass = (2 x Molar mass of H) + Molar mass of S - Molar mass = (2 x 1g/mol) + 32g/mol - Molar mass = 34g/mol

2. Molar volume at STP: - The molar volume at STP is approximately 22.4 L/mol.

To calculate the density of H2S gas at normal conditions, we can use the formula:

Density = Molar mass / Molar volume

Using the values above, we can calculate the density of H2S gas:

Density = 34g/mol / 22.4 L/mol

Calculating this, we find that the density of H2S gas at normal conditions is approximately 1.52 g/L.

Please note that the search results did not provide the exact density of H2S gas at normal conditions. However, using the calculations above, you can approximate the density based on the given molar mass and molar volume.