Question

При сжигании углеводорода массой 8,8 г образовалось 26, 4 г оксиду углерода(IV)Плостность в-ва при нормальных условиях 1, 96 г/л . Найдите его молекул.формулу.

Answer 1

ню(СО2)= 26,4/44= 0,6 моль           =>      ню(С)= 0,6 моль

m(Н)= 8,8- 0,6*12= 8,8-7,2= 1,6 г

ню(Н)= 1,6:1= 1,6 моль

СхНу

х:у=0,6:1,6= 1:2,67= 3: 8

С3Н8 - простейшая формула

М(С3Н8)= 44

p=m/v=ню*М/ню*22,4= М/22,4

М= 1,96*22,4=44 г/моль

n= 44/44=1

C3H8 - истинная формула

Answer 2

Calculation of Molar Mass

To find the molecular formula of the compound formed during the combustion of the hydrocarbon, we need to calculate the molar mass of the compound.

Given: - Mass of hydrocarbon burned = 8.8 g - Mass of carbon dioxide formed = 26.4 g

To calculate the molar mass, we need to determine the number of moles of carbon dioxide formed. We can use the molar mass of carbon dioxide to convert the mass of carbon dioxide to moles.

The molar mass of carbon dioxide (CO2) is calculated as follows: - Atomic mass of carbon (C) = 12.01 g/mol - Atomic mass of oxygen (O) = 16.00 g/mol - Molar mass of carbon dioxide (CO2) = (12.01 g/mol) + 2 * (16.00 g/mol) = 44.01 g/mol

Now, we can calculate the number of moles of carbon dioxide formed: - Moles of carbon dioxide = Mass of carbon dioxide / Molar mass of carbon dioxide = 26.4 g / 44.01 g/mol

Using the calculated number of moles of carbon dioxide, we can determine the number of moles of carbon in the hydrocarbon. Since the ratio of carbon to carbon dioxide is 1:1, the number of moles of carbon in the hydrocarbon is equal to the number of moles of carbon dioxide.

Finally, we can calculate the molar mass of the hydrocarbon by dividing the mass of the hydrocarbon by the number of moles of carbon.

Let's perform the calculations:

Molar mass of carbon dioxide (CO2) = 44.01 g/mol Moles of carbon dioxide = 26.4 g / 44.01 g/mol = 0.599 moles

Since the ratio of carbon to carbon dioxide is 1:1, the number of moles of carbon in the hydrocarbon is also 0.599 moles.

Molar mass of the hydrocarbon = Mass of hydrocarbon / Moles of carbon Molar mass of the hydrocarbon = 8.8 g / 0.599 moles

Now, we can calculate the molar mass of the hydrocarbon.

Calculation of Molar Mass of the Hydrocarbon

To calculate the molar mass of the hydrocarbon, we need to know the number of carbon atoms in the hydrocarbon. Since the ratio of carbon to carbon dioxide is 1:1, the number of moles of carbon in the hydrocarbon is equal to the number of moles of carbon dioxide.

Given that the molar mass of carbon is 12.01 g/mol, we can calculate the molar mass of the hydrocarbon as follows:

Molar mass of the hydrocarbon = Molar mass of carbon * Moles of carbon Molar mass of the hydrocarbon = 12.01 g/mol * 0.599 moles

Now, let's calculate the molar mass of the hydrocarbon.

Calculation:

Molar mass of the hydrocarbon = 12.01 g/mol * 0.599 moles

The molar mass of the hydrocarbon is 7.21 g/mol.

Therefore, the molecular formula of the hydrocarbon formed during the combustion is not determined based on the given information.