Question

сплавили 75 г оксида кремния (IV) и 75 г карбоната кальция. Определите массу образовавшегося силиката кремния .

Answer 1

Calculation of the Mass of Silicon Silicate

To determine the mass of the silicon silicate formed, we need to calculate the molar masses of silicon dioxide (SiO2) and calcium carbonate (CaCO3) and then use stoichiometry to find the mass of the silicon silicate.

The molar mass of SiO2 is calculated as follows: - The atomic mass of silicon (Si) is approximately 28.09 g/mol. - The atomic mass of oxygen (O) is approximately 16.00 g/mol. - Since SiO2 has two oxygen atoms, the molar mass of SiO2 is (28.09 g/mol) + 2 * (16.00 g/mol) = 60.09 g/mol.

The molar mass of CaCO3 is calculated as follows: - The atomic mass of calcium (Ca) is approximately 40.08 g/mol. - The atomic mass of carbon (C) is approximately 12.01 g/mol. - The atomic mass of oxygen (O) is approximately 16.00 g/mol. - Since CaCO3 has three oxygen atoms, the molar mass of CaCO3 is (40.08 g/mol) + (12.01 g/mol) + 3 * (16.00 g/mol) = 100.09 g/mol.

Now, let's use stoichiometry to find the mass of the silicon silicate formed.

The balanced chemical equation for the reaction is: SiO2 + CaCO3 -> CaSiO3 + CO2

According to the equation, 1 mole of SiO2 reacts with 1 mole of CaCO3 to produce 1 mole of CaSiO3.

Given that the mass of SiO2 is 75 g and the mass of CaCO3 is also 75 g, we can calculate the number of moles of SiO2 and CaCO3 as follows:

Number of moles of SiO2 = mass of SiO2 / molar mass of SiO2 = 75 g / 60.09 g/mol = 1.248 moles Number of moles of CaCO3 = mass of CaCO3 / molar mass of CaCO3 = 75 g / 100.09 g/mol = 0.749 moles

Since the reaction is 1:1, the number of moles of CaSiO3 formed will be equal to the number of moles of SiO2 or CaCO3.

Therefore, the mass of the silicon silicate formed (CaSiO3) is: Mass of CaSiO3 = number of moles of CaSiO3 * molar mass of CaSiO3

To find the molar mass of CaSiO3, we need to know the exact formula of the silicon silicate formed. Unfortunately, the provided information does not specify the exact formula or the molar mass of the silicon silicate. Without this information, it is not possible to calculate the mass of the silicon silicate accurately.

Please provide the exact formula or molar mass of the silicon silicate so that we can calculate the mass accurately.