Question

Сколько молекул содержится в бензоле С6Н6 массой 0,78 г, оксиде серы (IV) SO2 массой 0,064 г и оксиде азота (IV) NO2 количеством вещества 0,02 моль?

Answer 1

Узнать количество каждого вещества(n), потом использовать формулу N=n*Na(6,02* 10^23)
1)-nC6H6=0,78/Mr=0,78/78=0,01
N=0,01*6,02*10^23=0,06*10^23 молекул
2)-nSO2=0,064/64=0,01
N=0,001*6,02*10^23=0,00610^23 молекул
N(NO2)=0,02*6,02*10^23=0,12*10^23-молекул

Answer 2

Calculation of the Number of Molecules in Benzene (C6H6)

To calculate the number of molecules in benzene (C6H6) with a mass of 0.78 g, we need to use the concept of molar mass and Avogadro's number.

1. Calculate the molar mass of benzene (C6H6): - Carbon (C) has a molar mass of 12.01 g/mol. - Hydrogen (H) has a molar mass of 1.01 g/mol. - Benzene (C6H6) consists of 6 carbon atoms and 6 hydrogen atoms. - The molar mass of benzene can be calculated as follows: Molar mass of benzene = (6 * molar mass of carbon) + (6 * molar mass of hydrogen) = (6 * 12.01 g/mol) + (6 * 1.01 g/mol) = 72.06 g/mol + 6.06 g/mol = 78.12 g/mol

2. Calculate the number of moles of benzene: - We can use the formula: moles = mass / molar mass. - Substituting the given mass of benzene (0.78 g) and its molar mass (78.12 g/mol) into the formula: Moles of benzene = 0.78 g / 78.12 g/mol = 0.01 mol

3. Calculate the number of molecules in benzene: - Avogadro's number states that there are 6.022 x 10^23 molecules in 1 mole of any substance. - Therefore, the number of molecules in benzene can be calculated as follows: Number of molecules = Moles of benzene * Avogadro's number = 0.01 mol * 6.022 x 10^23 molecules/mol = 6.022 x 10^21 molecules

Therefore, there are approximately 6.022 x 10^21 molecules in benzene (C6H6) with a mass of 0.78 g.

Calculation of the Number of Molecules in Sulfur Dioxide (SO2)

To calculate the number of molecules in sulfur dioxide (SO2) with a mass of 0.064 g, we will follow a similar process.

1. Calculate the molar mass of sulfur dioxide (SO2): - Sulfur (S) has a molar mass of 32.07 g/mol. - Oxygen (O) has a molar mass of 16.00 g/mol. - Sulfur dioxide (SO2) consists of 1 sulfur atom and 2 oxygen atoms. - The molar mass of sulfur dioxide can be calculated as follows: Molar mass of SO2 = (1 * molar mass of sulfur) + (2 * molar mass of oxygen) = (1 * 32.07 g/mol) + (2 * 16.00 g/mol) = 32.07 g/mol + 32.00 g/mol = 64.07 g/mol

2. Calculate the number of moles of sulfur dioxide: - Using the formula: moles = mass / molar mass. - Substituting the given mass of sulfur dioxide (0.064 g) and its molar mass (64.07 g/mol) into the formula: Moles of SO2 = 0.064 g / 64.07 g/mol = 0.001 mol

3. Calculate the number of molecules in sulfur dioxide: - Using Avogadro's number, which states that there are 6.022 x 10^23 molecules in 1 mole of any substance: Number of molecules = Moles of SO2 * Avogadro's number = 0.001 mol * 6.022 x 10^23 molecules/mol = 6.022 x 10^20 molecules

Therefore, there are approximately 6.022 x 10^20 molecules in sulfur dioxide (SO2) with a mass of 0.064 g.

Calculation of the Number of Molecules in Nitrogen Dioxide (NO2)

To calculate the number of molecules in nitrogen dioxide (NO2) with a quantity of substance of 0.02 mol, we will follow a similar process.

1. Calculate the number of molecules in nitrogen dioxide: - Using Avogadro's number, which states that there are 6.022 x 10^23 molecules in 1 mole of any substance: Number of molecules = Quantity of substance * Avogadro's number = 0.02 mol * 6.022 x 10^23 molecules/mol = 1.2044 x 10^22 molecules

Therefore, there are approximately 1.2044 x 10^22 molecules in nitrogen dioxide (NO2) with a quantity of substance of 0.02 mol.

Please note that the sources provided do not directly answer the question. The calculations are based on the principles of molar mass, Avogadro's number, and the given masses or quantities of substances.