Question

Sodium carbonate decahydrate(Na,Co10H,O) is an important industrial chemical

Calculate its formula mass. [Atomic mass: Na = 23, C = 12.0 = 16 and H = 1]

Answer 1

Answer:

The molar mass of sodium carbonate is  

105.987 g/mol

Explanation:

To calculate the molar mass of a compound, multiply the subscript of each element from the formula times the molar mass of the element. The molar mass of an element is its atomic weight (relative atomic mass) on the periodic table in g/mol.

Molar mass of  

Na 2 CO 3

( 2 × 22.98976928 g/mol Na ) + ( 1 × 12.0107 g/mol ) + ( 3 15.999 g/molO ) = 105.987g/mol Na 2 CO 3

Answer 2

The Formula mass of Sodium Carbonate Decahydrate is 286g.

Sodium Carbonate Decahydrate is commonly known as Washing Soda.

• Washing soda can be prepared by using soda ash, which is a white crystalline solid which is soluble in water.
• Washing soda can be prepared effectively using Solvay's process.
• Washing soda can be used as a cleansing agent in laundry and house for washing clothes.
• Washing soda is also used in removing the hardness of water and in textile and paper industries for manufacture.
• Washing soda can also be used in the manufacturing of glass in the industries.

Formula Mass of Sodium Carbonate Decahydrate:-

Formula mass is defined as the sum of molar masses of all the atoms present in the empirical formula of the compound.

So, for Sodium Carbonate Decahydrate

Formula = Na2CO3.10H2O

Mass of Sodium (Na) = 23

Mass of Carbon (C) = 12

Mass of Oxygen (O) = 16

Mass of Hydrogen (H) = 1

Now, Formula Mass of Na2CO3.10H2O =

$m = (23 \times 2) + 12 + (16 \times 3) + 10 \times (1 \times 2 + 16)$

$m = 46 + 12 + 48 + (10 \times 18)$

$m = 106 + 180$

$m = 286$

Hence, The Formula mass of Sodium Carbonate Decahydrate is 286g.

#SPJ2