Question

Образец некоторого вещества содержит 1.5x10 в 23 степени молекул. Масса этого образца составляет 7г. Рассчитайте молярную массу этого вещества.

Answer 1

1,5*10^23/6*10^23=7/X
X=28

Answer 2

Calculation of Molar Mass

To calculate the molar mass of a substance, we need to know the number of moles and the mass of the sample. In this case, we are given that the sample contains 1.5x10^23 molecules and has a mass of 7 grams.

The molar mass is defined as the mass of one mole of a substance. It is expressed in grams per mole (g/mol). To calculate the molar mass, we can use the formula:

Molar Mass = Mass of Sample / Number of Moles

To find the number of moles, we can use Avogadro's number, which states that there are 6.022x10^23 molecules in one mole of a substance.

Let's calculate the molar mass of the given substance:

1. Number of Moles: - Number of moles = Number of molecules / Avogadro's number - Number of moles = 1.5x10^23 / 6.022x10^23 - Number of moles ≈ 0.249 mol

2. Molar Mass: - Molar Mass = Mass of Sample / Number of Moles - Molar Mass = 7 g / 0.249 mol - Molar Mass ≈ 28.11 g/mol

Therefore, the molar mass of the given substance is approximately 28.11 g/mol.