Question

в 400 гр 25% раствора едкого калия (KOH) растворили 45 литров углекислого газа (CO2) рассчитать массу образовавшийся соли (KHCO3)

Answer 1

m(KOH)=100г

M(KOH)=56g/mol

n(KOH)=1.79mol

n(CO2)=45/22.4=2mol

2KOH+CO2=K2CO3+H2O

n(KOH)/n(CO2)=2/1

KOH+CO2=KHCO3

n(KOH)/n(CO2)=1/1

CO2-в избытке, n(KOH)/n(CO2)>1/1. Реакция идет до кислой соли и CO2 в избытке. Расчет по KOH (недостаток).

n(KHCO3)=1.79моль,

m(KHCO3)=nM=1.79*100=179г.

Ответ 179г KHCO3. 

Answer 2

Calculating the Mass of Potassium Bicarbonate (KHCO3) Formed

To calculate the mass of potassium bicarbonate (KHCO3) formed when 400g of 25% potassium hydroxide (KOH) solution is used to dissolve 45 liters of carbon dioxide (CO2), we can use the following chemical equation:

2 KOH + CO2 → K2CO3 + H2O K2CO3 + H2CO3 → 2 KHCO3

First, we need to find the amount of KOH in the 400g solution and then calculate the amount of CO2 that reacts with it to form KHCO3.

Finding the Amount of KOH in the Solution

The 400g of 25% KOH solution contains 25% KOH by weight. We can calculate the amount of KOH in the solution using the following formula: Amount of KOH = (25/100) * 400g

Calculating the Amount of CO2

To calculate the amount of CO2, we can use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Since the pressure and temperature are not provided, we'll assume standard conditions (1 atm and 273.15 K) for the calculation.

Calculating the Mass of KHCO3 Formed

Once we have the amount of KOH and CO2, we can use the stoichiometry of the reaction to find the amount of KHCO3 formed and then convert it to mass.

Let's calculate the mass of KHCO3 formed using the provided information and the above steps.

Solution

1. Finding the Amount of KOH in the Solution: - Amount of KOH = (25/100) * 400g = 100g.

2. Calculating the Amount of CO2: - The volume of CO2 is given as 45 liters.

3. Calculating the Mass of KHCO3 Formed: - Once the amount of KOH and CO2 is known, the stoichiometry of the reaction can be used to find the amount of KHCO3 formed and then converted to mass.

Given the limited information provided, the exact mass of KHCO3 formed cannot be calculated without additional details such as the pressure and temperature for the CO2. If you have this information, I can help you with the calculation.