Question

Сколько молекул содержится в 2,5 кг ацетилена?

Answer 1

M(C2H2)=12*2+1*2=26n=m/Mn(C2H2)=2,5/26=0,096 Ответ: 0,096

Answer 2

Calculation of the Number of Molecules in 2.5 kg of Acetylene

To calculate the number of molecules in 2.5 kg of acetylene, we need to use the Avogadro's number and the molar mass of acetylene.

The molar mass of acetylene (C2H2) is approximately 26 g/mol.

First, we need to convert the mass of acetylene from kilograms to grams. Since 1 kg is equal to 1000 grams, 2.5 kg is equal to 2500 grams.

Next, we can calculate the number of moles of acetylene using the formula:

Number of moles = Mass / Molar mass

Number of moles = 2500 g / 26 g/mol

Now, we can use Avogadro's number to calculate the number of molecules:

Number of molecules = Number of moles * Avogadro's number

Avogadro's number is approximately 6.022 x 10^23 molecules/mol.

Let's calculate the number of molecules:

Number of molecules = (2500 g / 26 g/mol) * (6.022 x 10^23 molecules/mol)

Therefore, the number of molecules in 2.5 kg of acetylene is approximately 5.8 x 10^25 molecules.

Please note that the above calculation assumes that the acetylene is pure and contains only C2H2 molecules.