Question

Сколько тонн оксида кальция можно получить из 250 тонн извястника содержащего 20% примесей?

Answer 1

100%-20% примесей = 80% 
250*0.8=200 тонн чистого известняка 
уравнение реакции 
200т Хт 
СаСО3=СаО + СО2 
М=100.1 М=56 

пропорция 200*56/100.1=112 тонн оксида кальция.

Answer 2

Calculating the Amount of Calcium Oxide

To calculate the amount of calcium oxide that can be obtained from 250 tons of limestone containing 20% impurities, we can use the following steps:

1. Calculate the Amount of Pure Limestone: - 250 tons of limestone containing 20% impurities means that 80% of it is pure limestone. - 80% of 250 tons = 0.8 * 250 = 200 tons of pure limestone.

2. Determine the Chemical Composition: - The chemical formula for limestone is CaCO3, and when it is heated, it decomposes to form calcium oxide (CaO) and carbon dioxide (CO2).

3. Use the Chemical Equation: - The balanced chemical equation for the decomposition of limestone is: ``` CaCO3(s) → CaO(s) + CO2(g) ```

4. Calculate the Amount of Calcium Oxide: - From the balanced chemical equation, we can see that 1 mole of CaCO3 produces 1 mole of CaO. - The molar mass of CaCO3 is approximately 100.09 g/mol, and the molar mass of CaO is approximately 56.08 g/mol. - Using the molar masses, we can calculate the amount of CaO produced from 200 tons of pure limestone.

Calculation

- 200 tons of pure limestone is equivalent to: - 200,000,000 grams (since 1 ton = 1,000,000 grams) - Calculate the moles of CaCO3: - Moles = Mass / Molar Mass - Moles of CaCO3 = 200,000,000 g / 100.09 g/mol - Moles of CaCO3 = 1,999,400 moles - Since 1 mole of CaCO3 produces 1 mole of CaO, the moles of CaO produced will also be 1,999,400 moles. - Calculate the mass of CaO: - Mass = Moles * Molar Mass - Mass of CaO = 1,999,400 moles * 56.08 g/mol - Mass of CaO = 112,153,792 grams - Convert the mass back to tons: - 112,153,792 grams = 112,153,792 / 1,000,000 = 112.15 tons of CaO

Answer

- Therefore, from 250 tons of limestone containing 20% impurities, it is possible to obtain approximately 112.15 tons of calcium oxide.