Question

Масса гидроксида калия содержащего такое же количество вещества, сколько его в 4 г гидроксида натрия? А) 6,4 г В)5,6 г С)4,8 г D)7,2 г E)3,8 г Помогите пожалуйста!!!

Answer 1

Держи ответ: В) 5,6 грамм.

Answer 2

Calculation of the Mass of Potassium Hydroxide

To determine the mass of potassium hydroxide (KOH) that contains the same amount of substance as 4 g of sodium hydroxide (NaOH), we need to use the molar masses of the two compounds.

The molar mass of sodium hydroxide (NaOH) is approximately 40 g/mol, and the molar mass of potassium hydroxide (KOH) is approximately 56 g/mol.

We can use the formula:

Mass = Moles x Molar Mass

Let's calculate the number of moles of sodium hydroxide (NaOH) in 4 g:

Moles of NaOH = Mass of NaOH / Molar Mass of NaOH

Moles of NaOH = 4 g / 40 g/mol = 0.1 mol

Now, we can use the number of moles of sodium hydroxide (NaOH) to calculate the mass of potassium hydroxide (KOH):

Mass of KOH = Moles of KOH x Molar Mass of KOH

Moles of KOH = 0.1 mol

Mass of KOH = 0.1 mol x 56 g/mol = 5.6 g

Therefore, the mass of potassium hydroxide (KOH) containing the same amount of substance as 4 g of sodium hydroxide (NaOH) is 5.6 g.

So, the correct answer is B) 5.6 g.