Question

Сколько моль составляют и сколько молекул(атомов) содержат: А) 49г. H2SO4 Б) 280г. Fe Напишите подалуйста быстрее ,очень поможете.......

Answer 1

А) М=2+32+60=94г/моль. 49:94=(примерно)0.52

Answer 2

Calculation of Moles and Molecules in Given Substances

To calculate the number of moles and molecules (or atoms) in a given substance, we need to use the concept of molar mass and Avogadro's number.

1. Substance A: 49g of H2SO4 - Molar mass of H2SO4 = (2 * atomic mass of H) + atomic mass of S + (4 * atomic mass of O) - The atomic mass of hydrogen (H) is approximately 1 g/mol, sulfur (S) is approximately 32 g/mol, and oxygen (O) is approximately 16 g/mol. - Therefore, the molar mass of H2SO4 = (2 * 1 g/mol) + 32 g/mol + (4 * 16 g/mol) = 98 g/mol. - To calculate the number of moles, we divide the given mass by the molar mass: - Number of moles = mass / molar mass = 49 g / 98 g/mol = 0.5 mol. - To calculate the number of molecules, we use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol: - Number of molecules = number of moles * Avogadro's number = 0.5 mol * 6.022 x 10^23 molecules/mol = 3.011 x 10^23 molecules.

2. Substance B: 280g of Fe - Molar mass of Fe (iron) is approximately 56 g/mol. - To calculate the number of moles, we divide the given mass by the molar mass: - Number of moles = mass / molar mass = 280 g / 56 g/mol = 5 mol. - To calculate the number of atoms, we use Avogadro's number: - Number of atoms = number of moles * Avogadro's number = 5 mol * 6.022 x 10^23 atoms/mol = 3.011 x 10^24 atoms.

Therefore, the calculations for the given substances are as follows: - Substance A (49g of H2SO4): 0.5 moles and 3.011 x 10^23 molecules. - Substance B (280g of Fe): 5 moles and 3.011 x 10^24 atoms.

Please note that the values provided are approximate and based on the atomic masses and Avogadro's number commonly used in calculations.