Question

Цинк массой 13 грамм прореагировал с разбавленной соляной кислотой. Рассчитайте количество вещества и массу образовавшегося хлорида цинка.

Answer 1

Zn  +  2 HCl   =   ZnCl2   +  H2

n(Zn) = m(Zn)/M(Zn) = 13/65,38 = 0,199 моль

n(ZnCl2) = n(Zn) = 0,199 моль

m(ZnCl2) = n(ZnCl2)*M(ZnCl2) = 0,199*136,286 = 27,12 г

Answer 2

#### Calculation of the Amount of Substance and Mass of Zinc Chloride Formed To calculate the amount of substance and mass of zinc chloride formed when 13 grams of zinc reacts with diluted hydrochloric acid, we need to use the balanced chemical equation for the reaction between zinc and hydrochloric acid. The balanced chemical equation for the reaction is as follows: Zn + 2HCl -> ZnCl2 + H2 According to the equation, 1 mole of zinc reacts with 2 moles of hydrochloric acid to produce 1 mole of zinc chloride and 1 mole of hydrogen gas. To calculate the amount of substance of zinc, we need to convert the mass of zinc given (13 grams) to moles. The molar mass of zinc (Zn) is approximately 65.38 grams per mole Using this molar mass, we can calculate the amount of substance of zinc as follows: Amount of substance of zinc = Mass of zinc / Molar mass of zinc Amount of substance of zinc = 13 grams / 65.38 grams per mole Now, let's calculate the amount of substance of zinc chloride formed. Since the balanced equation shows that the stoichiometric ratio between zinc and zinc chloride is 1:1, the amount of substance of zinc chloride formed will be the same as the amount of substance of zinc. Next, to calculate the mass of zinc chloride formed, we need to use the molar mass of zinc chloride (ZnCl2). The molar mass of zinc chloride is approximately 136.29 grams per mole Using this molar mass, we can calculate the mass of zinc chloride as follows: Mass of zinc chloride = Amount of substance of zinc chloride * Molar mass of zinc chloride Now, let's plug in the values and calculate the amount of substance and mass of zinc chloride formed. Amount of substance of zinc = 13 grams / 65.38 grams per mole Amount of substance of zinc chloride = Amount of substance of zinc Mass of zinc chloride = Amount of substance of zinc chloride * 136.29 grams per mole **Note:** The molar masses used in this calculation are approximate values and may vary slightly depending on the source. Please perform the calculations using the given values and the formulas provided to obtain the final results.