Question

Рассчитайте объём водорода,полученного при взаимодействии 20,6 г кальция,содержащего 16% примесей с избытком раствора соляной кислоты.Помогите:)

Answer 1

Дано : 
m(Ca) = 20.6г
ω (Са) =  16%
---------
V(H2) - ?

Решение:
0.0824                           х
   Ca + 2HCl = CaCl2 + H2
1.m(Ca) = 20.6*16/100=3.296 г
2.кол.вещ (Са) =  3.296г/40 г/моль = 0.0824 моль
3.  0.0824/1=х/1
х=0.0824 (моль) - кол-во вещества (Н2)
4.V(H2)= 0.0824 моль * 22.4 л/моль = 1.84576 л

Answer 2

Calculation of Hydrogen Volume

To calculate the volume of hydrogen gas produced when 20.6 g of calcium, containing 16% impurities, reacts with an excess of hydrochloric acid, we need to follow these steps:

1. Calculate the moles of calcium: - The molar mass of calcium (Ca) is 40.08 g/mol. - The given mass of calcium is 20.6 g. - Therefore, the number of moles of calcium is calculated as follows: ``` moles of calcium = mass of calcium / molar mass of calcium = 20.6 g / 40.08 g/mol = 0.514 mol ```

2. Calculate the moles of impurities: - The impurities make up 16% of the calcium sample. - Therefore, the mass of impurities is calculated as follows: ``` mass of impurities = 16% of mass of calcium = 0.16 * 20.6 g = 3.296 g ``` - The molar mass of impurities is not provided, so we cannot calculate the moles of impurities accurately.

3. Calculate the moles of hydrochloric acid: - Since hydrochloric acid is in excess, we assume it is completely consumed in the reaction. - The balanced chemical equation for the reaction between calcium and hydrochloric acid is: ``` Ca + 2HCl -> CaCl2 + H2 ``` - From the equation, we can see that 1 mole of calcium reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas. - Therefore, the number of moles of hydrochloric acid is equal to the number of moles of calcium: ``` moles of hydrochloric acid = 0.514 mol ```

4. Calculate the moles of hydrogen gas: - From the balanced chemical equation, we know that 1 mole of calcium produces 1 mole of hydrogen gas. - Therefore, the number of moles of hydrogen gas is also equal to the number of moles of calcium: ``` moles of hydrogen gas = 0.514 mol ```

5. Calculate the volume of hydrogen gas: - To calculate the volume of hydrogen gas, we need to use the ideal gas law equation: ``` PV = nRT ``` where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T