The molar mass ofCaCO3isa)120b)70c)100d)90Correct answer is option 'C'. Can you explain this answer?

Question

Answer

Molar Mass

Molar mass relates the mass of a substance to the moles of the substance (g/mol). The mole in chemistry is sometimes called the chemist's ''dozen'' because it's a counting unit like a dozen. Just like there are 12 donuts in a dozen, there is 6.02 x 1023 atoms or molecules in a mole. Molar mass tells chemists how many grams of a substance are needed for 6.02 x 1023 atoms or molecules.

The molar mass of calcium carbonate is 100.086g/mol.

The first step of determining the molar mass is to determine the chemical formula of calcium carbonate, which is CaCO3. Then, multiply the atomic mass of each element by the number of atoms in the formula. You can find the atomic mass on the periodic table.

1 Ca: 1 x 40.078 g/mol = 40.078 g/mol

1 C: 1 x 12.011 g/mol = 12.011 g/mol

3 O: 3 x 15.999 g/mol = 47.997 g/mol

Add all the atomic masses to determine the molar mass.

40.078 g/mol + 12.011 g/mol + 47.997 g/mol = 100.086 g/mol

Answer

Molar mass of CaCO3 is equal to the sum of atomic mass of all the elements that is {(40)+(12)+(16×3)} = (40 + 12 + 48 )=100

Answer

Calculation of Molar Mass of CaCO3
The molar mass of a compound is calculated by summing the atomic masses of all the atoms present in one formula unit of the compound.

Atomic Masses of Elements
- Ca (Calcium) = 40
- C (Carbon) = 12
- O (Oxygen) = 16 (there are 3 oxygen atoms in CaCO3)

Calculation
Molar mass of CaCO3 = 40 (Ca) + 12 (C) + 3(16) (3 O)
= 40 + 12 + 48
= 100 g/mol
Therefore, the correct answer is option C, which is 100.

Answer

Ca - 40
c- 12
o- 16

caco3 - 40 +12+3×16 = 100

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