Question

Как вычислить массу вещества в химии?

Answer 1

Масса вещества = количество вещества * молярную/молекулярную массу
m=n*Mr

Answer 2

Calculating the Mass of a Substance in Chemistry

In chemistry, the mass of a substance can be calculated using the formula:

mass = number of moles × molar mass

Where: - number of moles refers to the quantity of the substance in moles. - molar mass is the mass of one mole of the substance.

To calculate the number of moles, you can use the formula:

number of moles = mass ÷ molar mass

Example Calculation:

If you have 15.0 grams of \(O_2\) (oxygen gas), and you want to calculate the mass of the substance, you can use the following steps:

1. Determine the molar mass of \(O_2\). The molar mass of \(O_2\) is 32.00 g/mol. 2. Use the formula: number of moles = mass ÷ molar mass Substituting the given values: number of moles = 15.0 g ÷ 32.00 g/mol This gives: number of moles = 0.469 moles 3. Finally, use the formula: mass = number of moles × molar mass Substituting the calculated number of moles and the molar mass: mass = 0.469 moles × 32.00 g/mol This gives: mass = 15.0 grams

This demonstrates how to calculate the mass of a substance in chemistry using the number of moles and the molar mass.

If you have any specific examples or further questions about calculating the mass of a substance in chemistry, feel free to ask!