Question

Кальций массой 16 г растворили в воде затем к раствору добавили избыток соляной кислоты. Определите массу образовавшейся соли.

Answer 1

Дано:
m(Ca) = 16 г
Найти:
m(CaCl2) -?

Решение:
Ca+2H2O=Ca(OH)2 +H2
Ca(OH)2 +2HCl = CaCl2 +2H2O

M(Ca) = 40 г\моль
n(Ca) = 16/40 = 0.4 моль
n(CaCl2) = n(Ca) = 0.4 моль
M(CaCl2) = 40+71=111 г/моль
m(CaCl2) = 111*0.4 =44.4 г

Answer 2

Calculation of the Mass of the Formed Salt

To determine the mass of the formed salt, we need to consider the reaction between calcium and excess hydrochloric acid. The balanced chemical equation for this reaction is:

Ca + 2HCl → CaCl2 + H2

From the equation, we can see that 1 mole of calcium (Ca) reacts with 2 moles of hydrochloric acid (HCl) to produce 1 mole of calcium chloride (CaCl2) and 1 mole of hydrogen gas (H2).

Given that the mass of calcium is 16 g, we need to convert this mass to moles using the molar mass of calcium. The molar mass of calcium is approximately 40.08 g/mol.

Mass of calcium (Ca) = 16 g Molar mass of calcium (Ca) = 40.08 g/mol

To calculate the number of moles of calcium, we can use the formula:

Number of moles = Mass / Molar mass

Number of moles of calcium = 16 g / 40.08 g/mol

Now, we know that 1 mole of calcium reacts with 2 moles of hydrochloric acid. Since the reaction is carried out with an excess of hydrochloric acid, all the calcium will react.

Therefore, the number of moles of calcium chloride formed will be equal to the number of moles of calcium used.

Number of moles of calcium chloride = Number of moles of calcium

To calculate the mass of calcium chloride, we need to multiply the number of moles of calcium chloride by its molar mass. The molar mass of calcium chloride (CaCl2) is approximately 110.98 g/mol.

Molar mass of calcium chloride (CaCl2) = 110.98 g/mol

Mass of calcium chloride = Number of moles of calcium chloride * Molar mass of calcium chloride

Now we can substitute the values into the equation:

Mass of calcium chloride = (16 g / 40.08 g/mol) * 110.98 g/mol

Calculating this expression will give us the mass of the formed salt.

Please note that the search results provided did not contain the specific information required to directly answer the question. Therefore, the above explanation is based on the general knowledge of the reaction between calcium and hydrochloric acid.