Question

M(CaO)=112г найти m(Ca)(OM)2-?​

Answer 1

Ответ:

Объяснение:

112 г                                    Х г

CaO      +      H2O     =      Ca(OH)2

n=1 моль                          n=1 моль

М = 56 г/моль                 М = 74 г/моль

m=56 г                              m=74 г

112 г   СаО    -    Х г    Са(ОН)2

56 г    СаО   -   74 г    Са(ОН)2

m(Ca(OH)2) = 112 * 74 / 56 = 148 г

Answer 2

To find the mass of Ca(OH)₂, we need to start with the given mass of CaO and use the molar masses of the compounds involved.

The molar mass of CaO (calcium oxide) is 56.08 g/mol.

To find the molar mass of Ca(OH)₂ (calcium hydroxide), we need to add the molar masses of calcium (Ca), oxygen (O), and hydrogen (H) together.

The molar mass of Ca is 40.08 g/mol. The molar mass of O is 16.00 g/mol. The molar mass of H is 1.01 g/mol.

Ca(OH)₂ consists of one calcium atom (Ca), two oxygen atoms (O), and two hydrogen atoms (H).

Molar mass of Ca(OH)₂ = (1 × molar mass of Ca) + (2 × molar mass of O) + (2 × molar mass of H) = (1 × 40.08) + (2 × 16.00) + (2 × 1.01) = 40.08 + 32.00 + 2.02 = 74.10 g/mol

Now, we can use the given mass of CaO to calculate the mass of Ca(OH)₂.

m(CaO) = 112 g (given)

Using the molar mass of CaO, we can calculate the number of moles of CaO:

moles of CaO = mass of CaO / molar mass of CaO = 112 g / 56.08 g/mol = 2 mol

Since the ratio of CaO to Ca(OH)₂ is 1:1, the number of moles of Ca(OH)₂ is also 2 mol.

Finally, we can find the mass of Ca(OH)₂ using its molar mass:

m(Ca(OH)₂) = moles of Ca(OH)₂ × molar mass of Ca(OH)₂ = 2 mol × 74.10 g/mol = 148.20 g

Therefore, the mass of Ca(OH)₂ is 148.20 grams.