Question

Сколько моль калия и воды нужно взять, чтобы получить 109 г раствора гидроксида калия, в котором число атомов водорода в 1,9 раза больше числа атомов кислорода? (считать, что вода в избытке)

Answer 1

Пусть надо взять х моль КОН и у моль Н2О. В них содержится соответственно х моль и у моль атомов кислорода, а также х моль и 2у моль атомов водорода. Получаем два уравнения:

1) х*М(КОН)+у*М(Н2О)=109
56х+18у=109
2) х+2у=1,9(х+у)

Решаем второе уравнение, получаем
у=9х
Подставляем во второе уравнение, решаем, получаем х=0,5. Тогда у=9х=9*0,5=4,5

m(KOH)=x*M(KOH)=0,5моль*56г/моль=28 г
m(H2O)=y*M(H2O)=4,5моль*18г/моль=81 г

Answer 2

Calculating the Amount of Potassium and Water Needed to Produce Potassium Hydroxide Solution

To calculate the amount of potassium and water needed to produce 109g of potassium hydroxide solution, we can use the molar mass of potassium hydroxide and the given ratio of hydrogen to oxygen atoms in the resulting solution.

1. Molar Mass of Potassium Hydroxide (KOH): - The molar mass of KOH is 56.11 g/mol.

2. Given Ratio of Hydrogen to Oxygen Atoms: - The number of hydrogen atoms is 1.9 times greater than the number of oxygen atoms in the resulting solution.

Using this information, we can calculate the amount of potassium and water needed.

Calculation:

Let's assume x moles of KOH and y moles of water are needed.

The molar mass of KOH is 56.11 g/mol. Therefore, the number of moles of KOH (x) can be calculated using the following equation: x = (mass of KOH) / (molar mass of KOH) x = 109g / 56.11 g/mol x ≈ 1.944 moles

As the number of hydrogen atoms is 1.9 times greater than the number of oxygen atoms, the number of moles of water (y) can be calculated using the following equation: y = 1.9 * x y ≈ 1.9 * 1.944 y ≈ 3.6936 moles

Therefore, approximately 1.944 moles of potassium and 3.6936 moles of water are needed to produce 109g of potassium hydroxide solution, where the number of hydrogen atoms is 1.9 times greater than the number of oxygen atoms.

This calculation assumes that water is in excess, as stated in the question.

I hope this helps! If you have further questions, feel free to ask.