Question

Вычислить массовую долю CaCO3

Answer 1

Mr ( Ca ) = 40                                                          w ( Ca ) = 100 * 0,4 = 40 %
Mr ( C ) = 12                                                             w ( C ) = 100 * 0,12 = 12 %
Mr ( O ) = 16 * 3 ( 3 атома )                                  w ( O ) = 100 * 0,48 = 48 %

Mr ( H2CO3 ) =  100

Answer 2

Calculating the Mass Fraction of CaCO3

To calculate the mass fraction of CaCO3, we can use the formula:

Mass Fraction = (Mass of CaCO3 / Total Mass) * 100%

Let's calculate the mass fraction using the molar masses of the elements in CaCO3.

The molar mass of CaCO3 is: - Ca: 40.08 g/mol - C: 12.01 g/mol - O: 16.00 g/mol (3 atoms)

Using the molar masses, we can calculate the mass fraction of CaCO3.

Calculation: 1. Mass of CaCO3 = (40.08 + 12.01 + (16.00 * 3)) g 2. Total Mass = Mass of CaCO3 3. Mass Fraction = (Mass of CaCO3 / Total Mass) * 100%

Let's perform the calculation:

Calculation Result: 1. Mass of CaCO3 = (40.08 + 12.01 + (16.00 * 3)) g = 100.09 g 2. Total Mass = 100.09 g 3. Mass Fraction = (100.09 g / 100.09 g) * 100% = 100%

Therefore, the mass fraction of CaCO3 is 100%.

This calculation is based on the molar masses of the elements in CaCO3 and the formula for calculating mass fraction.