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The calculator tool used to calculate the molar mass or the molecular weight of the given chemical formula is called as the molar mass calculator. Molar mass is one of the basic concepts in chemistry which is calculated by combining the individual atomic masses of the chemical elements in one mole of a chemical compound.

There are 2 atoms of Hydrogen. Atomic weight of each Hydrogen atom H is 1.00794.

There is 1 atom of Sulfur. Atomic weight of each Sulfur atom S is 32.0655.

There are 4 atoms of Oxygen. Atomic weight of each Oxygen atom is 15.9994.

Molar mass of H2SO4 = 2 (1.00794) + 32.0655 + 4 (15.9994) = 98.0791.

Therefore the molar mass of H2SO4 = 98.0 g/mole approximately.

There are 2 atoms of Sodium. Atomic weight of each Sodium atom Na is 22.989769282.

There is 1 atom of Carbon. Atomic weight of each Carbon atom C is 12.01078.

There are 3 atoms of Oxygen. Atomic weight of each Oxygen atom is 15.9994.

Molar mass of Na2CO3 = 2 (22.989769282) + 12.01078+ 3 (15.9994) = 105.98861.

Therefore the molar mass of Na2CO3 = 106.0 g/mole approximately.