Question

Вычислить массу соли, полученную растворением 1,3г цинка в соляной кислоте.

Answer 1

Дано:
m(Zn)=1.3г
Найти:
m(ZnCl₂)-?
Решение:
Zn+2HCl-->ZnCl₂+H₂
M(Zn)=65г/моль
n(Zn)=m/M=1.3/65=0.02моль
По реакции:
n(Zn)=n(ZnCl₂)=0.02моль
M(ZnCl₂)=136г/моль
m(ZnCl₂)=n*M=0.02*136=2.72г
Ответ:2,72г

Answer 2

Calculation of the Mass of Salt Obtained from Dissolving 1.3g of Zinc in Hydrochloric Acid

To calculate the mass of salt obtained from dissolving 1.3g of zinc in hydrochloric acid, we need to determine the chemical equation for the reaction between zinc and hydrochloric acid. The balanced equation for this reaction is:

Zn + 2HCl → ZnCl2 + H2

According to the balanced 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 mass of zinc chloride (salt) obtained, we need to convert the mass of zinc to moles using its molar mass, and then use the mole ratio from the balanced equation to determine the moles of zinc chloride produced. Finally, we can convert the moles of zinc chloride to grams using its molar mass.

Here are the steps to calculate the mass of salt obtained:

1. Calculate the moles of zinc: - Molar mass of zinc (Zn) = 65.38 g/mol - Moles of zinc = mass of zinc / molar mass of zinc - Moles of zinc = 1.3 g / 65.38 g/mol

2. Use the mole ratio from the balanced equation to determine the moles of zinc chloride: - According to the balanced equation, the mole ratio of zinc to zinc chloride is 1:1. - Moles of zinc chloride = moles of zinc

3. Calculate the mass of zinc chloride: - Molar mass of zinc chloride (ZnCl2) = 136.29 g/mol - Mass of zinc chloride = moles of zinc chloride * molar mass of zinc chloride

Let's calculate the mass of salt obtained:

1. Calculate the moles of zinc: - Molar mass of zinc (Zn) = 65.38 g/mol - Moles of zinc = 1.3 g / 65.38 g/mol = 0.0199 mol

2. Use the mole ratio from the balanced equation to determine the moles of zinc chloride: - Moles of zinc chloride = 0.0199 mol

3. Calculate the mass of zinc chloride: - Molar mass of zinc chloride (ZnCl2) = 136.29 g/mol - Mass of zinc chloride = 0.0199 mol * 136.29 g/mol = 2.71 g

Therefore, the mass of salt obtained from dissolving 1.3g of zinc in hydrochloric acid is approximately 2.71 grams.

Please note that the above calculation assumes the reaction goes to completion and there are no other side reactions or factors affecting the yield of the salt.