Question

Розрахуйте кількість речовини етанолу масою 230 г. У відповіді вкажіть число.​

Answer 1

Mr(C2H5OH)=24+6+16=46г/моль
n=m:Mr
n=230:46=0,2моль

Answer 2

Calculating the Amount of Ethanol

To calculate the amount of substance, we can use the formula:

Amount = Mass / Molar Mass

Where: - Amount is the number of moles of the substance. - Mass is the given mass of the substance. - Molar Mass is the mass of one mole of the substance.

Molar Mass of Ethanol

The molar mass of ethanol (C2H5OH) can be calculated by adding up the atomic masses of its constituent atoms.

- Carbon (C) has an atomic mass of approximately 12.01 g/mol. - Hydrogen (H) has an atomic mass of approximately 1.008 g/mol. - Oxygen (O) has an atomic mass of approximately 16.00 g/mol.

So, the molar mass of ethanol (C2H5OH) can be calculated as: Molar Mass = (2 * Atomic Mass of Carbon) + (6 * Atomic Mass of Hydrogen) + Atomic Mass of Oxygen

Let's calculate the molar mass of ethanol.

Calculation

Molar Mass of Ethanol (C2H5OH) = (2 * 12.01 g/mol) + (6 * 1.008 g/mol) + 16.00 g/mol Molar Mass of Ethanol ≈ 46.07 g/mol

Amount of Ethanol

Now, we can use the given mass of ethanol (230 g) to calculate the amount of ethanol.

Amount of Ethanol = Mass of Ethanol / Molar Mass of Ethanol Amount of Ethanol = 230 g / 46.07 g/mol

Let's calculate the amount of ethanol using the given mass.

Amount of Ethanol ≈ 4.99 moles

So, the calculated amount of ethanol is approximately 4.99 moles.