Question

calculate the formula unit mass of
Na2co3.5H2o
​

Answer 1

Answer:

The molar mass and molecular weight of Na2CO3·5H2O is 196.0648.

Answer 2

Given: The given compound is $Na_2CO_3.5H_2O$.

To find: We have to find the formula unit mass.

Solution:

The given compound is $Na_2CO_3.5H_2O$.

The atomic mass of Na is 23.

The atomic mass of C is 12 and Oxygen is 16.

The atomic mass of H is 1.

This compound had two Na atoms, one C atom and three oxygen atoms.

This compound also contains five water molecules.

So, its formula unit mass will be-

$23 \times 2 + 12 + 16 \times 3 + 5 \times (2 \times 1 + 16) \\ = 46 + 12 + 48 + 90 \\ = 196$

The formula unit mass of pentahydrated sodium carbonate is 196g.