Question

Обчисли масову частку (%) атомів у цинк йодиді Zn I2. Відповідь запиши у відсотках, через кому, з Точністю до десятих. ​

Answer 1

Ответ:

Mr[ZnI2] = Ar[I] * 2 + Ar[Zn] = 127 * 2 + 65 = 319

ω (I) = 254 : 319 * 100 = 79.5 %

ω (Zn) = 65 : 319 * 100 = 20.5 %

Объяснение:

Answer 2

Calculating the Mass Percentage of Atoms in Zinc Iodide (ZnI2)

To calculate the mass percentage of atoms in zinc iodide (ZnI2), we can use the formula:

Mass Percentage = (Mass of Element / Total Mass of Compound) x 100%

First, we need to find the molar masses of zinc (Zn) and iodine (I) from the periodic table.

- The molar mass of zinc (Zn) is approximately 65.38 g/mol. - The molar mass of iodine (I) is approximately 126.90 g/mol.

Now, we can calculate the molar mass of zinc iodide (ZnI2):

Molar mass of ZnI2 = (1 x molar mass of Zn) + (2 x molar mass of I) = (1 x 65.38 g/mol) + (2 x 126.90 g/mol) = 65.38 g/mol + 253.80 g/mol = 319.18 g/mol

Next, we can calculate the mass percentage of zinc and iodine in zinc iodide.

Mass Percentage of Zinc (Zn) in ZnI2: Mass of Zinc = (1 x molar mass of Zn) = 65.38 g Total Mass of ZnI2 = 319.18 g Mass Percentage of Zinc = (65.38 g / 319.18 g) x 100% = 20.5%

Mass Percentage of Iodine (I) in ZnI2: Mass of Iodine = (2 x molar mass of I) = 2 x 126.90 g = 253.80 g Total Mass of ZnI2 = 319.18 g Mass Percentage of Iodine = (253.80 g / 319.18 g) x 100% = 79.5%

Therefore, the mass percentage of atoms in zinc iodide (ZnI2) is: Zinc (Zn): 20.5% Iodine (I): 79.5%

The answer is written in percentages, separated by a comma, with a precision of one decimal place: 20.5%, 79.5%

This calculation provides the mass percentage of atoms in zinc iodide (ZnI2) with the required precision.