Question

сколько теплоты выделяется при сгорании 24 грамм графита если термохимическое уравнение реакции следующееC+O(2)-->CO(2)+393,5 кДЖцыфры в скобках нижние цыфры в формуле

Answer 1

24/12= 2 моль, но уравнение на 1 моль, значит 393,5*2=787 кДж

Answer 2

Calculating Heat Release from the Combustion of Graphite

To calculate the amount of heat released during the combustion of 24 grams of graphite using the given thermochemical equation, we can use the following steps:

1. Balancing the Equation: The given thermochemical equation is: C + O2 → CO2 + 393.5 kJ This equation represents the combustion of carbon (in the form of graphite) to produce carbon dioxide.

2. Molar Mass of Graphite: The molar mass of carbon (C) is approximately 12.01 g/mol.

3. Converting Grams to Moles: We can calculate the number of moles of carbon in 24 grams using the molar mass of carbon.

4. Using Stoichiometry: From the balanced equation, we can determine the amount of heat released when 1 mole of carbon is combusted.

5. Calculating Heat Release: By using the stoichiometric coefficients and the given heat of reaction, we can calculate the heat released when 24 grams of graphite are combusted.

Let's proceed with the calculations.

Calculation Steps

1. Molar Mass of Carbon (C): The molar mass of carbon is approximately 12.01 g/mol.

2. Converting Grams to Moles: Number of moles of carbon = Mass of carbon / Molar mass of carbon Number of moles of carbon = 24 g / 12.01 g/mol Number of moles of carbon ≈ 1.998 moles

3. Calculating Heat Release: The given thermochemical equation states that the combustion of 1 mole of carbon releases 393.5 kJ of heat.

Therefore, the heat released from the combustion of 24 grams of graphite can be calculated as follows: Heat released = Number of moles of carbon * Heat of reaction Heat released ≈ 1.998 moles * 393.5 kJ/mol Heat released ≈ 786.6 kJ

The heat released during the combustion of 24 grams of graphite is approximately 786.6 kJ.